| 单词 | alternating current |
| 例句 | The lamps that laced every building and walkway produced the most elaborate demonstration of electric illumination ever attempted and the first large-scale test of alternating current. The Devil in the White City 2003-02-11T00:00:00Z His body fevered and froze in alternating currents of temperature. The Great Santini 1976-01-01T00:00:00Z On the other side was Westinghouse Electric Company, with a bid to wire Jackson Park for alternating current, using patents that its founder, George Westinghouse, had acquired a few years earlier from Nikola Tesla. The Devil in the White City 2003-02-11T00:00:00Z George Westinghouse’s and Nikola Tesla’s rival idea of alternating current allowed electric power to be transmitted over long distances and into homes. Museum Review: New York Transit Museum 2011-12-15T23:03:45Z Soon, the director calls it a day, and she’s tearing the wig off and slipping into a fur, excitedly hurtling toward an evening that flickers with alternating currents of promise and disappointment. ‘The Passionate Thief,’ From 1960, Has Been Restored 2014-12-04T05:00:00Z Freeberg writes little of the industrial battle between direct current and alternating current and between the arc light and the incandescent light. ‘The Age of Edison’: The light bulb creates a new era 2013-03-07T20:48:34Z But the players maintained their assiduous fire, plugged into the alternating current of past and present. Review | Claremont Trio energetically amplifies historical currents 2019-12-16T05:00:00Z After parting ways with Edison, Tesla sold patents that relied on alternating current to industrialist George Westinghouse. 11 Surprising facts about Thomas Edison 2022-04-02T04:00:00Z It spans art as tradition and innovation, as private sketch and public monument, revealing a versatile sensibility fueled by alternating currents of Romanticism and Realism, not to mention a passion for Michelangelo. Art Review: Jean-Baptiste Carpeaux, a French Artist of Multiple Passions 2014-03-27T22:29:43Z The whole novel is powered by an alternating current of horror and wit. ‘The Power’ is our era’s ‘Handmaid’s Tale’ 2017-10-10T04:00:00Z Tesla found a way to use the higher-voltage alternating current, or AC, to overcome the distance limit and thus revolutionize the spread of electricity. ‘The Last Days of Night’: The flaws of Thomas Edison, both real and imagined 2016-08-22T04:00:00Z The huge novel, rich in historical detail, hums along irresistibly on alternating currents of outrage and retribution, trial and triumph, hatred and love. Review | Ken Follett’s latest epic is among the best audiobooks this month 2020-11-16T05:00:00Z Ample but intimate, each over 500 pages, the books brim with global and political preoccupations even as their primary power derives from the alternating currents of family devotion and repulsion. Jonathan Franzen Takes On the Domestic Ills of the 1970s 2021-10-05T04:00:00Z Edison is a proponent of direct current, while Westinghouse pushes alternating current. ‘The Current War’ Review: Edison vs. Westinghouse, Down to the Wire 2019-10-24T04:00:00Z Shame and bravado are the alternating currents of his act, yoked by hyper-articulate, cynical self-consciousness. ‘Annette’ Review: Love Hurts 2021-08-05T04:00:00Z It’s a family comedy and tearjerker both, with alternating currents of drollness and darkness. Arts & Leisure: Alexander Payne?s New Film, ?The Descendants? 2011-11-09T13:00:06Z One of the first West Coast reinforced concrete structures, the steam plant originally powered the Interurban Railway between Seattle and Tacoma and supplied direct current for Seattle streetcars and alternating current for Georgetown. Ghost stories arise from a horrific Georgetown steam plant casualty 2023-10-26T04:00:00Z Once the construction is completed, it will convert 1,250 megawatts of clean energy from direct current to alternating current power that will be fed directly into the state's power grid. Building begins on facility linking Canada hydropower to NYC 2023-09-19T04:00:00Z The Boat Time YouTubers have invested in a more efficient inverter, which turns the direct current generated by their solar panels into the alternating current used by the grid. Can narrowboat owners break with fossil fuels? 2023-08-21T04:00:00Z Along the way, it will cross northwestern Colorado and Utah, with conversion from direct to alternating current in central Utah. Build begins on Wyoming-to-California power line amid growing wind power concern 2023-06-20T04:00:00Z One obstacle is that EVs export direct current, but power sent to the grid needs to be alternating current. What It Would Take for Electric Vehicles to Help Power the Grid 2023-04-27T04:00:00Z If the source varies periodically, particularly sinusoidally, the circuit is known as an alternating current circuit. College Physics for AP Courses 2015-08-12T00:00:00Z At present, the stimulation method used - transcranial alternating current stimulation - is only possible in research laboratories. Brain stimulation boosts memory for a month 2022-08-22T04:00:00Z What was the major advantage of Westinghouse’s “alternating current” power invention? U.S. History 2014-12-30T00:00:00Z The transmission line’s direct-current section allows efficient, long-distance electricity transfer with no tie-ins to other power lines, while the alternating current segment is less efficient but connects to the rest of the grid. Build begins on Wyoming-to-California power line amid growing wind power concern 2023-06-20T04:00:00Z Watkins and her team are planning to try yet another type of electrical stimulation called transcranial alternating current stimulation, in which the current’s amplitude is not fixed but oscillates. Electrical stimulation of the brain may help people who stutter 2022-06-22T04:00:00Z A coil is rotated in a magnetic field, producing an alternating current emf, which depends on rotation rate and other factors that will be explored in later sections. College Physics for AP Courses 2015-08-12T00:00:00Z The high-voltage direct current of most EV battery packs is routed to an inverter that converts it to alternating current. Hurdle to broad adoption of EVs: the misperception they’re unsafe 2022-05-05T04:00:00Z “The Invention of Everything Else” incorporates a time machine into a novel that’s partially about Nikola Tesla, the engineer known for inventing alternating current electricity. Review: Why a writer of ghost stories took on her late father's unfinished novel 2022-04-07T04:00:00Z The site will generate 400 megawatts of alternating current, enough to power 80,000 homes, according to its website. The largest remaining tall-grass prairie in Texas is getting solar panels. Environmentalists can’t stop it. 2022-03-08T05:00:00Z There’s still a lot to be determined, such as how GM will convert power from the EV battery from direct current to alternating current. GM is working with PG&E to turn electric vehicles into a virtual power grid in California 2022-03-08T05:00:00Z Explain how you could thaw out a frozen water pipe by wrapping a coil carrying an alternating current around it. College Physics for AP Courses 2015-08-12T00:00:00Z To avoid large losses of power over long distances, the electricity must be converted from alternating current to direct current, and then back again at the other end. A Widening Web of Undersea Cables Connects Britain to Green Energy 2022-01-04T05:00:00Z There are connections for alternating current on both sides, and on the right, there is also a connection for direct current. Audi RS E-tron GT review: electric extravagance 2021-11-23T05:00:00Z The automaker says the Solterra’s lithium-ion battery can be charged with home alternating current chargers and also has the ability to handle DC fast charging on the road. Electric vehicles get spotlight at Los Angeles Auto Show 2021-11-17T05:00:00Z Hayakawa likened the technological choice facing the auto industry to the late 19th century contest that pitted direct current electricity transmission against alternating current. As autos go electric, Toyota chases hydrogen dream 2021-11-15T05:00:00Z A wire wrapped around the infant’s chest has an alternating current running through it. College Physics for AP Courses 2015-08-12T00:00:00Z If all devices go off, they are interconnected, typically linked with a red or orange wire to carry a direct current signal in addition to regular alternating current wires for power. How to replace wired smoke detectors — and prevent them from chirping 2021-10-15T04:00:00Z It can now require hours to fully charge an electric vehicle because most stations operate on a home-like alternating current. Automakers face a threat to EV sales: Slow charging times 2021-06-07T04:00:00Z About 10 percent of the energy that goes into them is lost converting alternating current from the electrical grid into direct current for the battery. It looks like the Batmobile, works on solar energy, and could be the future of cars First, an alternating current, where the direction of electric current periodically switches, is applied to the plastics for eight seconds. Plastic trash can now be recycled into ultra-strong graphene 2021-02-23T05:00:00Z A pickup coil located nearby has an alternating current induced in it due to the changing magnetic field of the initial wire. College Physics for AP Courses 2015-08-12T00:00:00Z Electronic devices that enable rectification are called diodes and are widely used to transform alternating current into direct current, protect electric circuits from excess voltage and detect electromagnetic waves. One-way supercurrent achieved in an electrically polar film 2020-08-18T04:00:00Z Each seeks to claim the mantle of brilliant inventor Nikola Tesla, who helped bring electricity to the masses by championing alternating current technology. Electric truck maker Nikola looks like Tesla 2.0 — except even riskier 2020-06-02T04:00:00Z Tesla is best known for developing the alternating current that helped safely distribute electricity at great distances, including from the hydroelectric plant at Niagara Falls in the mid-1890s. Serbia protests EU description of Tesla as famous Croat 2020-05-09T04:00:00Z This direct current pulse reaches an even higher temperature than the alternating current step, which is necessary to form high-quality graphene. Plastic trash can now be recycled into ultra-strong graphene 2021-02-23T05:00:00Z That overhaul changed everything but the steel shells of the cars, he said, including converting the propulsion systems from direct current to alternating current. N.J. Transit’s Most Troubled Trains Are Older Than Many of the Riders 2020-03-12T04:00:00Z His alternating current design clashes with Thomas Edison’s direct current model, though, and Edison begins a vicious campaign against AC that involves electrocuting dogs to death with it. Tesla is a weird, fourth-wall-breaking take on the internet’s favorite inventor 2020-01-29T05:00:00Z The company operates platforms and converter stations to turn direct current electricity from offshore turbines into alternating current used in onshore power systems, and transports power mainly to Germany’s industrial south. German North Sea wind capacity rose almost to 2020 target last year - TenneT 2020-01-13T05:00:00Z In one scene, Edison kills a horse in front of reporters to prove the dangers of alternating current in everyday life. Review | ‘The Current War’ is packed with historical detail, but the film lacks electricity 2019-10-21T04:00:00Z In this situation, one observes that an alternating current at frequency 2eV/ flows across the junction, where e is the charge of an electron and is the reduced Planck's constant. The Exquisite Precision of Time Crystals 2019-10-16T04:00:00Z The electricity generated by solar arrays or stored in batteries is in the form of direct current, and the electricity used on the grid is alternating current. To Keep the Lights on During Blackouts, Austin Explores Microgrids 2019-10-03T04:00:00Z Niagara Falls is the site where Tesla first tested his controversial alternating current electrical distribution system in the late 19th century, so there are Tesla memorials all over the place. Meet Taycan, Porsche's first all-electric sports car and Tesla's latest challenger 2019-09-04T04:00:00Z But it must measure whether inverters, which turn alternating current power from the grid into direct current used by car batteries, cause too much stress on the network. Germany's Opel town shows struggle for Europe to plug in electric cars 2019-06-07T04:00:00Z The inverter uses high-power transistors to boost the 200 volts from the Prius battery to about 500 volts, and converts electricity from direct current to alternating current. After second recall, Toyota Prius electrical system is still overheating 2019-04-14T04:00:00Z A Mission Revival-style electrical substation was built in 1907 to converted alternating current to direct current for the railway, and it still stands on Venice Boulevard, where it is now used as a theater. HBO to relocate its West Coast home from Santa Monica to Culver City 2019-04-03T04:00:00Z Tesla is best known for developing the alternating current that helped safely distribute electricity at great distances, including from the hydro-electric plant at Niagara Falls in the mid-1890s. 2 letters by inventor Nikola Tesla surface in Serbia 2019-03-27T04:00:00Z Floating or underwater cables carry direct current to an inverter on shore where it is converted to alternating current and sent to the local grid. Putting Solar Panels on Water Is a Great Idea--but Will It Float? 2019-02-07T05:00:00Z But if the mobile unit is permanently attached to the power supply with up to 30 kW via alternating current, the battery pack “perpetually recharges itself,” the automaker says in a news release. Volkswagen’s mobile charging station will help solve a key problem with EVs 2019-01-02T05:00:00Z Financial naiveté: The industrialist George Westinghouse financed the building of Tesla’s motor and alternating current system, buying Tesla’s patents in exchange for a lucrative royalty agreement. Lessons From Tesla (the Man, Not the Car) 2018-09-14T04:00:00Z It’s no surprise, then, that contempt and resentment have become the alternating currents of American political sentiment. Thank You for ‘Condescending’ 2018-08-28T04:00:00Z “They named what a better society might look like, thus establishing a standard by which to measure the alternating currents of progress and defeat.” Martin Duberman Points to the Failures of the Gay-Rights Movement 2018-07-09T04:00:00Z The device is subject to high internal temperatures that can damage transistors that convert lower-voltage direct current from the battery to higher-voltage alternating current for the motor. Electrical defects cause Priuses to stall; Toyota may be bracing for a legal fight as safety worries grow 2018-04-23T04:00:00Z In technical terms, power systems in Europe, and much of Asia and Africa, run on alternating current at 50 hertz, meaning that the flow of electricity changes directions 50 times per second. Clocks Slow in Europe? Blame Kosovo-Serbia Row 2018-03-08T05:00:00Z Electric power is delivered to our homes in the form of an alternating current, where the direction of the flow of electricity switches back and forth many times a second. Clocks are running slow across Europe because of an argument over who pays the electricity bill 2018-03-08T05:00:00Z Tesla is best known for developing the alternating current that helped safely distribute electricity at great distances, including from the hydro-electric plant at the Niagara Falls in mid-1890s. Serbia museum benefits from renewed interest in Nikola Tesla 2018-01-30T05:00:00Z Since electric currents generate magnetic fields, and if the current alternates so does the field, an alternating current creates a field that is continuously moving. It is now practical to refuel electric vehicles through thin air 2017-10-26T04:00:00Z Graham Moore’s “The Last Days of Night” fictionalizes the highly charged late-19th-century rivalry between Thomas Edison and George Westinghouse over the respective merits of direct and alternating current. Set in New York, Fit for the Hammock 2017-07-13T04:00:00Z He is best known for his pioneering work with electricity, including the design of modern alternating current, and for working with Thomas Edison. Serbian activists vow to defend Nikola Tesla's urn - BBC News 2017-06-06T04:00:00Z A Fort Hood statement says the hybrid renewable energy project, featuring the Phantom Solar Farm, produces 65 megawatts of alternating current. Solar panels renewable energy project dedicated at Fort Hood 2017-06-04T04:00:00Z “Destroyed by order of the court, enforced by the transmission of high-voltage alternating current through the lobes of his brain.” Robert Pirsig dies at 88; wrote counterculture classic 'Zen and the Art of Motorcycle Maintenance' 2017-04-24T04:00:00Z When a vehicle equipped with a suitable “pickup” coil stops or parks above this device, and alternating current is fed into the pad, a similar current is induced in the pickup. It is now practical to refuel electric vehicles through thin air 2017-10-26T04:00:00Z George Westinghouse, a prolific inventor and rival of Thomas Edison, founded the company in 1886. Its technological breakthroughs included the commercializing of alternating current generators and transformers. Bet on nuclear power sends Westinghouse into bankruptcy 2017-03-29T04:00:00Z Another rivalry, between Edison and George Westinghouse — and, by proxy, Nikola Tesla — involved the commercialization of direct versus alternating current for America’s electricity system. In New Jersey, Exploring the Innovations of Thomas Edison 2017-03-08T05:00:00Z Or the underdog — alternating current, a superior technology devised by the eccentric genius Nikola Tesla and licensed by George Westinghouse? New crime fiction from Oscar-winning screenwriter, comic-caper master and more 2016-09-11T04:00:00Z The summer has ended with a real sleeper gem in “Hell or High Water,” the recent release that seems to be catching audiences off-guard with its alternating currents of anger and sadness. The indie summer provided a cure for for blockbuster blues 2016-08-27T04:00:00Z The wholesale price for Tesla’s home battery is $3,000—excluding the operating software, labor and other installation costs as well as the inverter, which converts direct current into alternating current. Elon Musk Has Big Hopes for Storage Batteries, but the Market Is Small 2016-08-08T04:00:00Z You likely have two separate warranties: one for the panels and another for the inverter, which converts the energy produced by your panels into alternating current that actually powers your house. What Homebuyers Should Know About Solar Panels 2016-06-15T04:00:00Z The ashes of the man who developed, among other things, the alternating current electricity supply system widely in use today, are preserved in a gold-colored sphere in the Nikola Tesla museum in the Serbian capital. Dispute erupts in Serbia over plan to move Nikola Tesla's ashes 2016-06-02T04:00:00Z The meters are rated CAT III 600 volts and measure voltage up to 600 volts and alternating current up to 400 amps. Recalls this week: Infant bicycle helmets, climbing gear 2016-05-20T04:00:00Z In a preliminary study, Frohlich and his colleagues measured a person's alpha frequency with an EEG, then applied an alternating current at a matching frequency. Neurostimulation: Bright sparks : Nature : Nature Publishing Group 2016-03-01T05:00:00Z This increases variability in voltage, in power and in the frequency of alternating current. Energy: Reimagine fuel cells 2015-09-22T04:00:00Z In this process an alternating current passing through a coiled wire creates an oscillating magnetic field. Coiled and ready to strike 2015-06-25T04:00:00Z In its heyday, mill operations were among the first powered by alternating current from the Ames Hydroelectric Generating Plant near Ophir. Small hydroelectric industry growing in Colorado 2015-02-07T05:00:00Z It relies on an alternating current that moves through a coil via a charging pad to drum up magnetic fields to spark a charge. 6 Companies Pushing Wireless Charging Into The Mainstream 2014-10-15T04:00:00Z Some researchers, for example, are using alternating current, which targets brain oscillations, instead of direct current, on the basis of the theory that this may be a more natural way to stimulate the brain. Neurostimulation: Bright sparks : Nature : Nature Publishing Group 2016-03-01T05:00:00Z The inverters convert the direct current generated by the panels into the alternating current, allowing it to be tied into “the grid” operated by Pepco. Benefits of solar panels clear after two years That field then induces another alternating current in a second, nearby coil. Coiled and ready to strike 2015-06-25T04:00:00Z It has a black box theater with a ceiling-mounted 3-D projector, so, in theory, students could program a 3-D projected Nicolas Tesla to give a lecture on alternating currents. What Classrooms Can Learn From the Google Campus An inverter converts the direct current from solar panels into alternating current for use at a home or business, or for feeding into the grid. Why Now Is A Good Time To Invest In Solar Manufacturing and Marketing In The U.S. 2014-07-17T04:00:00Z We all owe Nikola Tesla a debt of gratitude: the Serbian-American inventor was integral in designing the alternating current electrical supply systems that power the modern world. Elon Musk donates $1 million to Nikola Tesla museum after webcomic calls him out 2014-07-11T04:00:00Z Everywhere in the modern world, the throb of alternating current generates electromagnetic waves — from the television, the blender, the light bulbs, the wires in the wall. Debate Continues on Hazards of Electromagnetic Waves 2014-07-07T04:00:00Z In 1907, Tesla's alternating current technology was being licensed by Westinghouse Electric & Manufacturing Co. Elon Musk opens up Tesla patents to everyone 2014-06-12T04:00:00Z In 1907, Tesla’s alternating current technology was being licensed by Westinghouse Electric & Manufacturing Co. Elon Musk opens up Tesla patents to kickstart electric car industry 2014-06-12T04:00:00Z Consider the effects of synchronized national 60 cycle alternating current transmission on the planet as it relates to the solar cycles. Scientists Report Finding Reliable Way to Teleport Data 2014-05-29T04:00:00Z The great inventor Thomas Edison promoted the lethal power of alternating current in an attempt to discredit his business rival George Westinghouse. America’s Long and Grisly Search for the Perfect Way to Kill 2014-04-30T19:51:47Z Before people had electricity in their homes, the alternating current–producing motor constructed by Tesla supplied 90 percent of the electricity used by manufacturing. What Are the 10 Greatest Inventions of Our Time? 2013-10-21T15:15:09.237Z The total storage capacity of these capacitive/inductive devices is very small relative to grid demand and only operates on a shorter time scale than a single cycle of alternating current. What Is The Holding Capacity Of The US Power Grid? 2013-10-07T16:58:00Z The first major use of alternating currents electricity took place at the fair, with Westinghouse outbidding General Electric. 'BioShock Infinite' Review: Across The Multiverse (PC) 2013-04-03T14:05:14Z Plug loads refer to electric power consumed by products through an ordinary alternating current plug socket. Energy Waste Rebounds: Top 10 Energy Pigs in the Plug 2012-12-08T03:15:02Z The Columbian Exposition also marked the dawn of a new technological era, introducing the alternating current lightbulb developed by Westinghouse, and showing visitors myriad other innovations and marvels. 'BioShock Infinite' Preview: Devil In The Flying City 2012-12-07T19:30:24Z Tesla, best known for establishing alternating current as the basis for the modern transmission of electrical power, died in 1943 at age 86 on the 33rd floor of the New Yorker Hotel in Manhattan. Group Buying Long Island Estate for Tesla Memorial 2012-10-06T03:10:36Z Tesla is best known for establishing alternating current as the basis for the modern transmission of electrical power. To Keep Tesla’s Flame Bright, Fans Return to His Workshop 2012-08-27T20:31:22Z The Serbian-American inventor is best known for his work on alternating current, radio, and electromagnetism. Tesla museum campaign tops target 2012-08-22T18:22:46Z Tesla is best known for his work on alternating current and his ideas were used in the development of radio communications, the electric motor and radar. Nikola Tesla museum campaign smashes fundraising target 2012-08-22T11:59:17Z Inman had already produced a comic piece testifying to Tesla being "the greatest geek who ever lived", as "inventor" of alternating current, and a host of other things. Geek mythology and Nikola Tesla 2012-08-20T12:37:26Z But the rule, in place since the devastating blackout of 1977, applies only to alternating current, the standard form of electricity in high-voltage transmission systems in North America. Merits of Power Line From Quebec to New York City Are Debated 2012-08-20T01:17:46Z Tesla is credited with the discovery of alternating current electricity and neon lighting, among other pioneering projects. Nikola Tesla museum campaign earns $500,000 online in two days 2012-08-17T17:30:36Z At each end, an inverter plant converts the regular, alternating current into more transportable direct current. More French power flowing to Britain in time for games 2012-07-27T17:42:57Z Tesla won the "current wars" – alternating current now powers almost every home and building in the world – but Edison nonetheless became the richer man through his myriad other businesses. Nikola Tesla museum campaign smashes fundraising target 2012-08-22T11:59:17Z Some companies are working on improving the efficiency of power electronics that converts the direct current from each solar panel into alternating current. Photos: A Tour Of A Solar Energy Trade Show 2012-07-12T15:32:25Z His rival George Westinghouse was in favour of alternating current, as developed in Europe. A universal plug socket... at last? 2012-05-31T23:41:40Z Today Tesla is credited with the discovery of alternating current electricity and neon lighting, among other pioneering projects. Nikola Tesla museum campaign earns $500,000 online in two days 2012-08-17T17:30:36Z Yes, Edison did put on public demonstrations where he electrocuted animals to show the dangers of alternating current. Nikola Tesla Wasn't God And Thomas Edison Wasn't The Devil 2012-05-18T05:41:49Z In operating an induction coil with rapidly alternating currents, we realize with astonishment, for the first time, the great importance of the relation of capacity, self-induction and frequency as regards the general results. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z On the high-voltage grid, electricity is moved as alternating current, meaning that the electrons alternate their direction 60 times a second. Green Blog: A Speed Record on the Power Grid 2012-03-19T18:32:54Z This plethora of standards probably goes back to the beginnings of public electricity in the late 19th Century and the battle between AC - alternating current - and DC - direct current. A universal plug socket... at last? 2012-05-31T23:41:40Z This led to the development of semiconductor rectifiers, devices that convert alternating current into direct current, which were used for communication and radar in both world wars. Material history: Learning from silicon 2012-03-14T22:50:51.667Z It’s worth pointing out that alternating current is superior to direct current when it comes to the transmission of electricity. Nikola Tesla Wasn't God And Thomas Edison Wasn't The Devil 2012-05-18T05:41:49Z In this manner, direct or alternating currents may be converted, and in both cases the current-impulses may be of any desired frequency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Many of the preparations are intended to address the loss of all alternating current, which drives pumps and operates valves. Green Blog: An Ad-Hoc Solution for Extra Nuclear Safety 2012-03-06T22:42:12Z There are certain minds whose processes convey the impression of alternating currents of high voltage on a wire that is not quite large enough for them. The Gentle Reader 2012-02-15T03:00:37.463Z That’s led St. Kitts and Nevis to envisage one day exporting all that surplus energy to neighboring islands via high voltage alternating current submarine cables. Trouble in Paradise: How a Caribbean Experiment in Geothermal Went Awry 2012-02-07T00:35:37Z First of all, I’d contend that nearly every invention in the engineering or sciences is an improvement on what has come before – such as Tesla’s improvements to alternating current. Nikola Tesla Wasn't God And Thomas Edison Wasn't The Devil 2012-05-18T05:41:49Z The case is thus analogous to that in which a condenser shunted by a conductor of low resistance is connected to a source of alternating current. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A steady flux or drift of electrons in one direction and co-electrons in the opposite direction is a continuous electric current, whilst their mere oscillation about a mean position is an alternating current. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z They are alternating currents of electricity, currents that are constantly and suddenly circulating backward and forward. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z A device for causing the alternating currents generated in the armature to flow in the same direction in the external circuit. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z His Serbian-born rival Tesla, who at one stage worked with Edison, figured out how to send "alternating current" through transformers to enable it to step up the voltage for transmission over longer distances. Insight: How renewable energy may be Edison's revenge 2011-12-20T11:16:32Z A number of ways, as practiced in the laboratory, of obtaining these currents either from continuous or low frequency alternating currents, is diagramatically indicated in Fig. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Hence an electrical oscillation, which is merely a very rapid alternating current taking place in a conductor, is on this hypothesis assumed to consist in a rapid movement to and fro of the free electrons. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This would give a more rapid alternating current and a higher electro-motive force than would be the case with a smaller number of loops of wire. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z How the Dynamo Produces Direct Current: The Commutator.—The essential difference between an alternator and a dynamo is that the alternator delivers alternating current to the external circuit while the dynamo delivers direct current. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z For most of the last century, the power that has reached the sockets in our homes and businesses is alternating current. Insight: How renewable energy may be Edison's revenge 2011-12-20T11:16:32Z In this arrangement a rotating transformer g, is employed to convert the low tension direct currents into low frequency alternating currents, preferably also of small tension. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z In place of the alternating current, Mr. Brown finds that a revolving permanent magnet can be used to produce the alternating magnetisation of the pole pieces of the sensitive tube or coherer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Ohm’s law is given a simple explanation with reference to wiring for direct and alternating currents. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z In both machines, as before stated, alternating currents are induced in the armature, but the kind of current delivered to the external circuit depends on the manner in which the armature currents are collected. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z The only problem is that Beacon's owner went bankrupt in the process of putting the "alternating" into alternating current—after taking a loan for $39.5 million from the U.S. Will Energy Storage Play a Big Role in the Electric Grid? 2011-11-22T16:15:00.477Z The three branches of the circuit A represent the usual cases met in practice when alternating currents are converted. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Accordingly, we are limited at the present moment to one of two appliances—viz., the induction coil or the alternating current transformer. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Includes direct and alternating current boards, also those for arc lighting, incandescent and power circuits. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z It is usually accepted as meaning a steady or non-pulsating direct current; one that has a uniform pressure and constant direction of flow as opposed to an alternating current. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z In this remarkable instrument alternating current enters at a, passes through the fine wire and leaves at b. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z The surest to injure and destroy life, is a continuous current, but the most painful is an alternating current of very low frequency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Several ways have been suggested for extinguishing the alternating current arc which forms between the spark balls connected to the secondary terminals when these are brought within a certain distance of one another. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This is the only complete work issued showing and telling you what you should know about direct and alternating current wiring. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z The word dynamo is used to designate a machine which produces direct current as distinguished from the alternator or machine generating an alternating current. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z The amount of the turning indicates the strength of the alternating current. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Assume that a source of alternating current S be connected, as in Fig. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z On occasions where continuous current alone is available, a motor generator has to be employed converting the continuous current into an alternating current. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Alternating Current—Usually referred to as "AC," alternating current is current which reverses its direction of flow at regular intervals, 60 times a second. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z The sine curve is a wave-like curve used to represent the changes in strength and direction of an alternating current. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z One trouble in connection with measuring these alternating currents is that they are very reluctant to pass through a coil. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z One has at his disposal either direct or alternating currents from a supply station. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A nasty battle erupted between the two sides, including a campaign in which Edison electrocuted a circus elephant named Topsy to illustrate the dangers of alternating current. Direct Current Technology Gets Another Look 2011-11-17T23:57:26Z In the case of alternating current, AC, such as most homes and buildings use, the electricity flows in first one direction and then the other. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z An elementary alternator is shown at the left to illustrate the application of the sine curve to the alternating current cycle. Hawkins Electrical Guide, Number One Questions, Answers, & Illustrations, A Progressive Course of Study for Engineers, Electricians, Students and Those Desiring to acquire a Working Knowledge of Electricity and its Applications 2011-12-24T03:07:54.823Z It thus eliminates every alternate current and changes the alternating current into a series of intermittent currents all in the same direction. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z It is well to take certain precautions when operating a Ruhmkorff coil with very rapidly alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Their purpose is to help regulate the frequency on the grid so that the electrons dance back and forth precisely 60 times every second, which is the alternation in “alternating current” or AC power. Green Blog: Solyndra Has a Cousin in the Poorhouse 2011-11-17T22:21:10Z The two geniuses go their separate ways after several similar clashes, but not before Edison, whose power company employs the direct-current system of electrical distribution, repudiates Tesla’s faith in alternating current. | New Jersey: Edison and Tesla Spat in ?The Dangers of Electric Lighting? ? Review 2011-11-06T00:42:48Z One is regulation, which means injecting or subtracting power rapidly to keep the grid at a strict 60 cycles per second, the alternation in alternating current. Green Blog: Better Batteries: Not Just for Cars Anymore 2011-10-31T20:20:47Z By a cunning use of alternating current this is done without in any way interfering with the action of the cranks as described above. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z An interesting feature of the arc produced by these rapidly alternating currents is its persistency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The battery installation will also assist with a different kind of grid stabilization: trying to keep the alternating current system correctly synchronized. Batteries on a Wind Farm Help Control Power Output 2011-10-29T01:11:06Z When Tesla joins forces with George Westinghouse, whose company, driven by alternating current, competes with Edison’s interests, Edison wages a campaign to demonize the type of power he cannot abide. | New Jersey: Edison and Tesla Spat in ?The Dangers of Electric Lighting? ? Review 2011-11-06T00:42:48Z Each generator housing contains a 280-ton turbine that looks like a ship’s propeller and a 430-ton generator rotor that spin in perfect synchronization with the grid’s alternating current. The High-Stakes Math Behind the West's Greatest River 2011-10-20T19:15:03Z It is, however, possible to make an electric magnet of special design which will work sufficiently well with alternating current to answer our present purpose. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Selecting, then, any circuit through which is flowing an alternating current, Mr. Tesla divides such circuit at any desired point into two branches or paths. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z A microinverter is an electronic device that goes on the back of each solar panel to convert the direct current produced by the panel into alternating current. Home Security Firm Enters Solar Market With $75M Fund 2011-10-19T05:56:28Z In the receiver the alternating current will alternately strengthen and weaken the magnetic field, and as it does so the pull of the magnet on the iron disk is strengthened and weakened. The Story of Great Inventions 2011-10-05T02:00:16.353Z That project, 45 miles west of Phoenix, will use an unusual system to convert the electricity into alternating current, the kind that is transmitted on the power grid. $1 Billion in U.S. Loan Guarantees to 2 Solar Projects 2011-09-29T02:27:40Z Generally speaking, alternating current is no use for energising a magnet. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Of all the experiments which may be performed with rapidly alternating currents the most interesting are those which concern the production of a practical illuminant. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Westinghouse Electric was founded in 1886 and built in part on Nikola Tesla’s patents for technology using alternating currents. Shaw to Sell Westinghouse Stake to Toshiba, Cutting Debt 2011-09-06T14:23:04Z Now a current of varying strength in the primary induces an alternating current in the secondary. The Story of Great Inventions 2011-10-05T02:00:16.353Z Alternating Current Galvanometers.—For the detection of small alternating currents a magnetic needle or movable coil galvanometer is of no utility. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z And it so happens that we can easily use a set of such forks to test the rate of alternation of an alternating current. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z In general, most of the experiments usually performed with a static machine can be performed with an induction coil when operated with very rapidly alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The three are separate because the alternating current is not synchronized among them; the only connections are relatively weak direct current links. Green: Reddy Kilowatt Works Up a Sweat 2011-08-05T21:27:24Z The work done in lifting the telephone receiver a distance of one foot, if changed into an alternating current, would be sufficient to keep up a sound in the receiver for a hundred thousand years. The Story of Great Inventions 2011-10-05T02:00:16.353Z When an alternating current passes through the resistance it creates heat which in turn acts on the thermo-junction and generates a continuous current in the loop, thus deflecting it in the magnetic field. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z These machines can produce either alternating or continuous currents, in fact the alternating current dynamo is really simpler than the more familiar continuous-current machine. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Of the various branches of electrical investigation, perhaps the most interesting and the most immediately promising is that dealing with alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The installation will rely on a new kind of inverter, the device that turns the direct current from solar cells into the alternating current used on the electric grid. Maker of Silicon Wafers Wins Millions in U.S. Loan Support 2011-06-17T04:31:18Z This alternating current, of course, flows over the line-wire and through the coil in the receiver. The Story of Great Inventions 2011-10-05T02:00:16.353Z The Duddell thermal ammeter is another very sensitive form of alternating current galvanometer. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Small alternators are used sometimes, however, to supply alternating current to the primary of an induction coil, or transformer, as it is more often called in its larger sizes. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z This investigation, then, it goes without saying, deals with alternating currents, and to be more precise, with alternating currents of high potential and high frequency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Beyond capturing electricity, they will perform a second function: they will help keep the alternating current of the regional electric grid working at exactly the right rate. Green: Saving Juice on a Philadelphia Subway Line 2011-06-13T12:07:29Z This alternating current acts on the magnetic field of the receiver in the way described before, causing the disk in the receiver to vibrate and give out the sound. The Story of Great Inventions 2011-10-05T02:00:16.353Z An electric generator supplies the source of electricity for operating an induction coil to transform the low pressure into an alternating current of high pressure. The Universe a Vast Electric Organism 2011-06-09T02:00:22.450Z Some electric railways are worked with alternating current, and it is used for lighting quite as much as direct current and is equally satisfactory. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z In operating an induction coil with very rapidly alternating currents, among the first luminous phenomena noticed are naturally those presented by the high-tension discharge. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z This plug was so constructed that the alternating current, fatal to the instrument, did not pass through it. The Radio Boys' Search for the Inca's Treasure 2011-04-30T02:00:12.743Z With an alternating current this can be done and the current changed by means of a transformer to a current of low pressure. The Story of Great Inventions 2011-10-05T02:00:16.353Z A steady flux or drift of electrons in one direction, and co-electrons in an opposite direction, is a continuous electric current, while their mere oscillation about a mean position is an alternating current. The Universe a Vast Electric Organism 2011-06-09T02:00:22.450Z By a roundabout but very effective way he rectifies the current to be measured, for he first converts some of the alternating current into heat and then converts that heat into continuous current. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z Having noted for years the many advantages obtainable with alternating currents, Mr. Tesla was naturally led on to experiment with them at higher potentials and higher frequencies than were common or approved of. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The substation plant reduces the pressure to a value suitable to the consumer, and in many instances also converts the alternating current into direct current. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Thus an alternating current in the primary induces an alternating current in the secondary. The Story of Great Inventions 2011-10-05T02:00:16.353Z These grids carry alternating current at different frequencies, preventing large-scale diversion of electricity from power plants outside the affected region. Japan Faces Power Struggle 2011-04-12T19:45:02.467Z To realise the almost miraculous delicacy of these wonderful instruments we need first of all to construct a mental picture of what takes place in a circuit through which alternating current is passing. Marvels of Scientific Invention An Interesting Account in Non-technical Language of the Invention of Guns, Torpedoes, Submarine Mines, Up-to-date Smelting, Freezing, Colour Photography, and many other recent Discoveries of Science 2011-11-19T03:00:24.517Z There is still another and far more striking peculiarity of the brush discharge produced by very rapidly alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Electric motors are classified as direct-current motors or alternating-current motors, according as the electric power taken by the motor is in the form of a direct current or an alternating current. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z This can be done only by means of an alternating current. The Story of Great Inventions 2011-10-05T02:00:16.353Z The current line shared by Minnkota and Minnesota Power carries an alternating current, meaning all of the power has to travel the path of least resistance. 'Saudi Arabia of Wind' Has Trouble Figuring Out How to Get the Power Out 2011-04-05T18:15:00.463Z As a consequence alternating current at the strength of the national supply flowed through his hands, arms and across his chest. Toddler's plug death 'avoidable' 2011-04-05T13:24:25Z F is a two-circuit alternating current motor, one of the circuits being connected with the main circuit from the source E, and the other being supplied with currents from the secondary of the transformer. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The nature of the low-voltage distribution from the substations, whether alternating current or direct current, depends largely on the requirements of the consumers. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z A peculiar transformer which produces an alternating current that changes direction millions of times in a second has been made by Nikola Tesla. The Story of Great Inventions 2011-10-05T02:00:16.353Z The second, also a major challenge, requires lowering the costs and raising the performance of the electronics that convert direct current from photovoltaic solar power to alternating current used on the grid. How to Turn a New Clean Energy Process into a Company 2011-02-01T18:45:00.250Z Current measuring instruments depending on this fact, called hot-wire ammeters, are in common use, especially for measuring alternating currents. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z He shows that, at least with very rapidly alternating currents of high potential, the discharge may work through almost any practicable thickness of the best insulators, if air is present. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z An alternating current of 4000 amperes at 110 volts is used for a 3-ton furnace, and the intensity of the current passing through the bath is regulated by raising or lowering the electrodes. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z When an alternating current and transformers are used, the current that lights the lamps in the houses or on the streets is not the current from the dynamo. The Story of Great Inventions 2011-10-05T02:00:16.353Z The classic function for the electronics attached to a panel is to convert the direct current produced by the solar cells into alternating current, at 60 cycles. Green: For Excess Solar Flow, a Veg-O-Matic for Voltage 2011-01-27T13:01:58Z Rutherford used a method by which the period of the vibration can easily be determined; it is based upon the theory of the distribution of alternating currents in two circuits ACB, ADB in parallel. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The study of such rapidly alternating currents is very interesting. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z There are certain advantages in the use of direct current, and in this country it is more commonly employed than alternating current, but the substation plant is more costly and requires skilled attendance. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z A number of such dynamos are used supplying an alternating current at a pressure of 22,000 volts, the current alternating or changing direction twenty-five times per second. The Story of Great Inventions 2011-10-05T02:00:16.353Z This evidently cannot occur with an alternating current, as the impulse in one direction is counteracted by the following one in the opposite direction. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z An instrument of this form is valuable in measuring small alternating currents by the fall of potential produced down a known resistance. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z In this manner he is enabled to extend very greatly the applications of his system and to secure all the advantages of both forms of alternating current motor. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Very high-frequency alternating currents may be passed through the body without producing the muscular contractions which are a feature of the passage of low-frequency currents through the tissues. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z What an entry on the man responsible for the work behind the birth of the alternating current powering your desktop computer. Lost in Wikipedia 2011-01-14T09:51:07Z Unaffected by wind, and suitable for either continuous or alternating currents. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z The rolled sheet iron and sheet steel which is in request for the construction of magnet cores, especially those in which the exciting current is an alternating current, are, generally speaking, produced from Swedish iron. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Let A B represent the poles of an alternating current motor, of which C is the armature wound with coils D, closed upon themselves, as is now the general practice in motors of this kind. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It works like this: the alternating current in the conductors creates a magnetic field. Green: Move Over, WALL-E: Puttering Along Power Lines 2011-01-12T13:14:30Z At earlier world’s fairs, the key draws were often exotic products from distant lands and gee-whiz inventions like the Ferris wheel and the alternating current system of electricity. Special Report: Shanghai World Expo: Shanghai Expo 2010 Turns Spotlight on Nations 2010-05-31T04:32:00Z It can be shown that as each arm approaches a magnet a current will be induced in one direction, which will be reversed as each arm recedes; and therefore an alternating current will be produced. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z Alternating Currents.—The study of alternating currents of electricity began to attract great attention towards the end of the 19th century by reason of their application in electrotechnics and especially to the transmission of power. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The brushes bearing on the continuous portions for taking off the alternating currents are represented by a' b' c' d'. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z That would open up a variety of possibilities, Strano says, because alternating current is the basis for radio waves such as cell phone transmissions, but present energy-storage systems all produce direct current. Researchers Discover New Way of Producing Electricity 2010-03-09T15:35:00Z The "soft-iron" ammeter can be used for both direct and alternating currents, is inexpensive, and is sufficiently accurate for commercial use. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli It is evident that the carbons must be consumed equally, for which reason use must be made of the alternating current. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z In ordinary electrolytic work only the continuous current may of course be used, but in electrothermal work an alternating current is equally available. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z It is evident that a pulsatory as well as an alternating current might be used to drive or operate the motors above described. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z This alternating current is conducted to a frequency meter, which consists of a powerful electro-magnet, over which are placed magnetised steel springs, having different natural periods of vibration. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 It measures both direct and alternating currents, and, when properly used, has a high degree of accuracy. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli If, however, some means is employed for joining B and C by a conductor, the alternating current is produced as before. Wrinkles in Electric Lighting 2011-01-22T03:00:17.277Z In the case of a simple periodic alternating current having a simple sine wave form, the maximum value is equal to that of the equiheating continuous current multiplied by √2. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Let it be assumed that an ordinary alternating current generator is connected up in a circuit of practically no self-induction, such, for example, as a circuit containing incandescent lamps only. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z “He could have talked with you, but he couldn’t ring your bell without a magneto or an alternating current of some kind.” Whispering Wires The "induction" type cannot be used for direct currents, and has the limitation that with alternating currents it will read correctly only at the frequency for which it is calibrated. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli It is almost always stated that arc lamps for alternating currents should be arranged with the carbons vertical, and many makers actually so construct their lamps as to allow of this. Optical Projection Part 1: Projection of Lantern Slides A circuit in which a simple periodic alternating current flows is called a single phase circuit. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z On the operation of the machine, alternating currents will be developed in the circuit, and the phases of these currents will theoretically coincide with the phases of the impressed electromotive force. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z What’s the idea of having an alternating current of low voltage on the same line with a talking current of three volts? Whispering Wires In alternating-current circuits its place is taken by the dynamometer type, which reads both direct and alternating currents. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli This last remark perhaps hardly applies to alternating currents, which, however, I have not yet discussed. Optical Projection Part 1: Projection of Lantern Slides If two alternating currents having a fixed difference in phase flow in two connected separate but related circuits, the two are called a two-phase current. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z That there are only electrostatic effects active seems to be clearly proved by Mr. Tesla's experiments with an induction coil operated with alternating currents of very high frequency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The copper tube, which has an alternating current induced in it, is attached to solid disks of steel which in turn are attached to a steel diaphragm an inch thick. The Social Gangster The alternating currents of speech and interrupter signaling are kept from passing to ground at terminals by the impedance coils. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The 'hum' of an alternating current cannot be altogether eliminated, but can be reduced to a minimum by reducing the voltage as far as possible. Optical Projection Part 1: Projection of Lantern Slides He also devised an alternating current electrical machine in which the discharge balls were alternately positive and negative. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z A point of great importance in the introduction of high tension alternating current which Mr. Tesla brings out is the necessity of carefully avoiding all gaseous matter in the high tension apparatus. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z I have harnessed the alternating current in a brand-new way, I think. The Social Gangster The operation of the bell through these turns induces an alternating current in the selector winding which flows out on the line and is heard as a distinctive buzzing noise by the dispatcher. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The same ready power of transformation unfortunately does not apply to the continuous current, or alternating currents would probably never have been heard of, but as it is they are very common. Optical Projection Part 1: Projection of Lantern Slides It is there reduced in voltage by transformers and employed as an alternating current, or is used to drive polyphase motors coupled to direct current generators to reproduce the power in continuous current form. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z A description is given elsewhere of a method of operating alternating current motors by first rotating their magnetic poles until they have attained synchronous speed, and then alternating the poles. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Similarly an alternating current ammeter can be calibrated by comparison with an electrodynamometer, the reading of which varies as the square of the current. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" The opposition of impedance coils to alternating currents and of condensers to direct currents are the fundamentals. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. It was while in Yonkers that Steinmetz drew attention to his ability by a series of articles in an American electrical magazine on alternating currents. The Scrap Book, Volume 1, No. 4 June 1906 This invention in conjunction with an alternating current dynamo provided a new and simple form of electric arc lighting. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z On this principle Mr. Tesla constructs a motor having independent field circuits of different self-induction, which are joined in derivation to a source of alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The required power may be obtained from the mains of an ordinary electric supply with either direct or alternating current, but the former is preferable. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Pole changers for ringing bells of harmonic party lines are required to produce alternating currents of practically constant frequencies. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Any convenient source of alternating current may be used. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" Steinmetz and J. Swinburne, and great improvements made in the alternating current dynamo by W.M. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Strong as his convictions on the subject then were, it is a fact that he stood very much alone, for the alternating current had no well recognized place. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z The signal from the radio station is an alternating current that sets up a corresponding current in the antenna wire. The Blue Ghost Mystery Sources of both direct and alternating current are required and a single exchange may employ these for one or more of the following purposes: Direct Current. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. With alternating currents, however, it is impossible to use a galvanometer in the usual way. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The diaphragm vibrates back and forth in tune with the alternating current in the receiver winding. Letters of a Radio-Engineer to His Son Even Mr. Tesla himself did not, until after protracted effort and experimentation, learn how to construct alternating current apparatus of fair efficiency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z But as the minutes speed, he knows that he is electrified with alternating currents from her glowing face and that they bring to him a rapture that he has never known before. In the Heart of a Fool It is not usual to produce the direct current by actually rectifying the alternating current, but merely by omitting half the impulses, sending to the line only alternate half-cycles of the current generated. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The galvanometer was therefore replaced by Kohlrausch by a telephone, which gives a sound when an alternating current passes through it. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" If we should gradually increase the frequency of the alternating current you would find that about sixty or perhaps a hundred cycles a second would give you the impression of a musical note. Letters of a Radio-Engineer to His Son The effects of resonance are being more and more noted by engineers and are becoming of great importance in the practical operation of apparatus of all kinds with alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z For heating and lighting, this alternating current is just as good as the direct current, and it is probably what you have in your own home. Common Science This rectifier also has the advantage of opening the charging circuit when the alternating current supply fails, and starting again automatically when the line is made alive again. The Automobile Storage Battery Its Care And Repair The plate CD is connected with an alternating current dynamo, which produces a simply-periodic potential difference between AB and CD, the other pole being put to earth. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" When the slider is at a there is less resistance in the antenna circuit and a larger alternating current. Letters of a Radio-Engineer to His Son This he successfully accomplished in his apparatus, and with this apparatus, now, scientific men will be provided with the necessaries for carrying on investigations with alternating currents with great precision. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Name three uses of the direct current, and tell how it differs from the alternating current. Boy Scouts Handbook The First Edition, 1911 The Stahl rectifier supplies the alternating current from a transformer instead of generating it as is done in a direct current generator. The Automobile Storage Battery Its Care And Repair Coils in the floor induced alternating currents in the flesh itself, very like those currents used for supposed medical effects in "medical batteries," and "shockers." Invasion It would have an alternating current induced in it. Letters of a Radio-Engineer to His Son A number of features pointed out above have also been used by the writer in connection with some types of alternating current motors. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z Understand the difference between a direct and an alternating current, and show uses to which each is adapted. How Girls Can Help Their Country The battery is connected as shown, the positive terminal directly to one side of the alternating current supply, and the negative terminal to the graphite electrode "A." The Automobile Storage Battery Its Care And Repair The direction of the current is therefore reversed; and as the change is repeated every half-revolution this form of dynamo is called an alternator or creator of alternating currents. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use When the key in the plate circuit of the audion at the sending station is depressed an alternating current is started. Letters of a Radio-Engineer to His Son Corresponding to the previous figures, A is the generator of alternating currents, B B the line, and C D the two branches for the direct currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z They knew they could generate alternating current of any frequency they chose by use of a special collector apparatus. Empire If two bulbs are used, as shown ill Figure 51, each half of the alternating current wave is used in charging the battery. The Automobile Storage Battery Its Care And Repair An alternating current is not so convenient for some purposes as a continuous current. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use This induces an alternating current in the neighboring antenna circuit. Letters of a Radio-Engineer to His Son The output of such an apparatus is very small, but some of the effects peculiar to alternating currents of short periods may be observed. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z In a general way alternating currents of low frequency are the most injurious to the body, and any current pressure higher than two hundred volts is dangerous to life. The Home Medical Library, Volume I (of VI) Apparatus for converting alternating current into direct current. The Automobile Storage Battery Its Care And Repair Consequently speech produces rapidly alternating currents in the circuit, their duration and intensity depending on the nature of the sound. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use Ordinarily we say that a condenser impedes an alternating current less and less the higher is the frequency of the current. Letters of a Radio-Engineer to His Son Another disadvantageous feature is found in the difficulty of maintaining an alternating current arc in consequence of the periodical increase in resistance corresponding to the periodical working of the current. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z When one goes into higher voltages, it is necessary to change the type of dynamo to alternating current, so that the current can be transformed to safe voltages at the point where it is used. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The desired action is secured by a combination of a permanent magnet and an electromagnet which is connected to the alternating current supply. The Automobile Storage Battery Its Care And Repair Motors may be run with direct or alternating current, according to their construction. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use And as to inductances, we say that an inductance impedes an alternating current 138more and more the higher is the frequency. Letters of a Radio-Engineer to His Son These rapidly alternating currents render it possible to maintain small arcs which, besides, possess the advantages of silence and persistency. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z An alternating current, on the other hand, flowing through a coil of wire, would make a magnet that changed its poles with each half-cycle. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine To take care of variations in the voltage of the alternating current supply from 100 to 130, a set of connections is provided which are numbered 105, 115, and 125. The Automobile Storage Battery Its Care And Repair An alternating current, of course, affects both carbons in the same manner, and there is no bowl. How it Works Dealing in simple language with steam, electricity, light, heat, sound, hydraulics, optics, etc., and with their applications to apparatus in common use More generally it is known as the “regenerative circuit” because the tube keeps on generating an alternating current. Letters of a Radio-Engineer to His Son When the cylinder B with the charged coatings is rotated, a circuit connected to the terminals T is traversed by alternating currents. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z This is an alternating current, so called because it changes its direction. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Mechanical rectifiers are operated from the secondary windings of transformers which reduce the voltage of the alternating current line to the voltage desired for charging. The Automobile Storage Battery Its Care And Repair The constant speed of alternating current motors at once places them at a disadvantage for this work of high peak and intermittent loads. Principles of Mining Valuation, Organization and Administration The position of the plunger becomes then a measure of the strength of the alternating current. Letters of a Radio-Engineer to His Son If the presence of the fluid be assumed to vary rhythmically, this may be taken as corresponding to the case of an alternating current. The inventions, researches and writings of Nikola Tesla With special reference to his work in polyphase currents and high potential lighting 2012-03-28T02:00:22.660Z It may be attached to any electric light socket of 110 volts direct or alternating current. Seasoning of Wood The two wires extending from the top of the Tungar should be connected to the alternating current supply of the same voltage and frequency, as stamped on the name plate attached to the front panel. The Automobile Storage Battery Its Care And Repair The artist’s command of this alternating current, the swiftness with which he modulates these moods into one another, is the measure of his power. The Lost Art of Reading So far I haven’t stopped to tell what we mean by one ampere of alternating current. Letters of a Radio-Engineer to His Son He saw the alternating currents of life in this family: there was now rest, now unrest, now quiet, now storm. The Goose Man Dynamos, motors, arc-lights, alternating current, the X-ray—these are a few of the things which followers of the profession have created for the uses of mankind. Opportunities in Engineering The equipment for constant current charging uses a lamp bank or rheostat to regulate the charging current where direct current is available, and a rectifier or motor-generator set where only alternating current is available. The Automobile Storage Battery Its Care And Repair Hence the necessity for alternating currents by which this equal consumption is secured. Fragments of science, V. 1-2 The fact that iron decreases the inductance and so seriously impedes alternating currents leads us to use iron-core coils where we want high inductance. Letters of a Radio-Engineer to His Son Then they need friends, too, to encourage: opposition and encouragement—thus do we get the alternating current. Little Journeys to the Homes of the Great, Volume 7 Little Journeys to the Homes of Eminent Orators Harvard supplied him the alternating current; he influenced the people in his environment, and he was influenced by his environment. Little Journeys to the Homes of the Great Philosophers, Volume 8 That is, only one-half of each alternating current wave passes through it to the battery. The Automobile Storage Battery Its Care And Repair M. Serrin modified his excellent lamp with the express view of enabling it to cope with alternating currents. Fragments of science, V. 1-2 And now we can see how to make an audion produce an alternating current or as we sometimes say “make an audion oscillator.” Letters of a Radio-Engineer to His Son The alternating current gives power: only an obstructed current gives either heat or light; all good things require difficulty. Little Journeys to the Homes of the Great - Volume 13 Little Journeys to the Homes of Great Lovers Condensers made in this way resist the application of alternating currents perfectly, as the following tests will show. On Laboratory Arts This device is admirable where the alternating current is used, because the current moves back and forth, and the two electrodes are thus burned away at the same rate of speed. Electricity for Boys The Siemens and the Gramme machines delivered direct currents, while those of Holmes and the Alliance Company delivered alternating currents. Fragments of science, V. 1-2 In radio we use alternating currents which have very high frequencies. Letters of a Radio-Engineer to His Son After the teaching had well begun, there set in an alternating current of intensity that wrought mightily for the destruction of dead prejudices, and the building up of character. Charles Carleton Coffin War Correspondent, Traveller, Author, and Statesman I want to try alternating current instead of direct and see if doing so won't improve it. Tom Swift and His Giant Telescope The term applied to a change in the direction of an alternating current, the frequency of the alternations ranging up to 20,000 or more vibrations per second. Electricity for Boys M. Gramme subsequently so modified his machine as to produce alternating currents. Fragments of science, V. 1-2 Of course, we have to use a different frequency of alternating current for each of the two conversations. Letters of a Radio-Engineer to His Son The carbon dioxide so formed, together with the nitrogen entering as air, escape at G. An alternating current is used. An Elementary Study of Chemistry They were to learn later, in their exploration of the ship, that the invaders' ray projectors were fed from a separate generator, which produced a special form of alternating current wave for them. The Black Star Passes Time, therefore, is an element in the operation of alternating currents. Electricity for Boys "Such is the case, however; but there is no real positive or negative in the alternating current, so that either side may be termed positive or negative." The Wonder Island Boys: Exploring the Island The result is that the center of the diaphragm moves back and forth during one complete cycle of the alternating current in the coil. Letters of a Radio-Engineer to His Son Neither woman spoke for a minute, or made any sign, but you could almost see the alternating current of scorn and hate that passed between them. The Lion of Petra What were they doing with an alternating current in the storage-battery room? The Man Who Rocked the Earth This can be done more efficiently by means of the alternating current, which is subject to far less loss than isp. Electricity for Boys The alternating current is supposed to be more fatal than the continuous. Aids to Forensic Medicine and Toxicology That goes on over and over again just as often as the alternating current passes through one cycle of values. Letters of a Radio-Engineer to His Son There are also transformers for developing 60-cycle, alternating current at voltages of from 110 to 2,200. Transactions of the American Society of Civil Engineers, vol. LXX, Dec. 1910 Federal Investigations of Mine Accidents, Structural Materials and Fuels. Paper No. 1171 It dawned upon him that there might be something here undreamed of in electrical engineering—a storage battery for an alternating current! The Man Who Rocked the Earth For alternating currents, however, the abutment stop may be used on both electrodes. Scientific American Supplement, No. 315, January 14, 1882 I do not want to be understood as undervaluing the position of the alternating current in central station work. Scientific American Supplement, No. 1178, June 25, 1898 If we started with a very low-frequency alternating current, say one of fifteen or twenty cycles per second, you wouldn’t say you heard a note at all. Letters of a Radio-Engineer to His Son They are characterized by a humming noise due to the effect of alternating current upon the mechanism and also upon the air near the arc. Artificial Light Its Influence upon Civilization This battery not only was charged by an alternating current, but delivered one of high potential. The Man Who Rocked the Earth In each sub-station but one set of high-potential alternating current bus bars is installed and between each incoming cable and these bus bars is connected an oil switch. The New York Subway Its Construction and Equipment There are various methods of producing the alternating current for transmission purposes. Scientific American Supplement, No. 1178, June 25, 1898 There is impressed upon the grid of the detector an alternating e. m. f. which has the same frequency as the alternating current which is being produced at the sending station. Letters of a Radio-Engineer to His Son They are made for both direct and alternating current and the mechanisms have been of several types. Artificial Light Its Influence upon Civilization At first it was soft and nebulous, but it increased rapidly in brilliancy, and a dull roar, like that of a waterfall, added itself to the hum of the alternating current in the wires. The Man Who Rocked the Earth The signal lighting is supplied by a special alternating current circuit independent of the power and general lighting circuits. The New York Subway Its Construction and Equipment This flame is approximately seven feet in diameter and appears to be continuous although an alternating current of fifty cycles a second is used. Creative Chemistry Descriptive of Recent Achievements in the Chemical Industries To measure an alternating current or voltage we can use a hot-wire instrument or one of several different types of electromagnetic instruments. Letters of a Radio-Engineer to His Son When examined under a microscope, parts of the filament operated on alternating current appear to be offset. Artificial Light Its Influence upon Civilization Hence, in rapidly alternating currents the conductor section is practically lessened, being restricted largely to the outer metal of the conductor. Scientific American Supplement, No. 711, August 17, 1889 The system for furnishing power to operate and control the signals consists of the following: Two 500-volt alternating current feed mains run the entire length of the signal system. The New York Subway Its Construction and Equipment Such alternating currents are unsatisfactory for many purposes, and to be of service are in many cases transformed into direct currents; that is, current which flows steadily in one direction. General Science The alternating current flows in a coil; and a piece of 207soft iron is so pivoted that it can be attracted and moved into the coil. Letters of a Radio-Engineer to His Son The light was fairly steady and these arcs operated satisfactorily on alternating current. Artificial Light Its Influence upon Civilization As a practical consideration, we may mention in this connection that a self-inductive coil for currents of one direction must be constructed differently from one to be used with alternating currents. Scientific American Supplement, No. 711, August 17, 1889 It will also be seen that this meter is good for alternating currents. Scientific American Supplement, No. 620, November 19,1887 The magneto transmitter produces alternating current without input of any electricity at all; the carbon transmitter merely controls a direct current, supplied by an external source, and varies its amount without changing its direction. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This increased e. m. f., of course, results in an increased amplitude for the alternating current which the oscillator is supplying to the transmitting antenna. Letters of a Radio-Engineer to His Son It has no positive or negative carbons, for the alternating current is reversing in direction usually at the rate of 120 times per second; that is, it passes through 60 complete cycles during each second. Artificial Light Its Influence upon Civilization This, together with his ingenuity, has led him to devise an entirely new and very ingenious modification, which will no doubt have a very great effect on the development of alternating current motors. Scientific American Supplement No. 822, October 3, 1891 Instead of dry cells or accumulators a small foot or hand operated dynamo generating direct, not alternating current, might be used. Things To Make Such a telephone is at once the simplest known form of electric generator or motor for alternating currents. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The result is, it does not let the alternating currents of the oscillating tube flow into the modulator. Letters of a Radio-Engineer to His Son It is efficient; capable of subdivision; operates on direct and alternating current; requires little attention; and is capable of most successful use with light-controlling apparatus. Artificial Light Its Influence upon Civilization Telephonic currents—that is, currents induced in the secondary wire of an induction coil due to the variation of microphonic currents in the primary wire—are not alternating currents. Scientific American Supplement No. 822, October 3, 1891 He rightly attributes many of the repulsion phenomena to the lag in phase of the alternating currents thus induced in the conducting metal. Scientific American Supplement, No. 787, January 31, 1891 It is important to note that it is change, and change only, which produces that alternating current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. You remember that I told you how capacity effects rob the distant end of a pair of wires of the alternating current which is being sent to them. Letters of a Radio-Engineer to His Son The immense stimulus that the announcement of Mr. Tesla's work gave to the study of alternating current motors would, in itself, be enough to stamp him as a leader. Experiments with Alternate Currents of High Potential and High Frequency It is, he said, generally assumed that there is no difficulty in making commercial condensers for high pressure alternating currents. Scientific American Supplement, No. 795, March 28, 1891 In Norway, they use an alternating current of only 5,000 volts, between water-cooled copper electrodes, as I have already told you. The Air Trust The impedance of a few turns of heavy wire may be negligible to alternating currents of ordinary frequencies because the resistance of the wire is low, its inductance small, and the frequency finite. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. That is 259always true but the effect is not very great unless the frequency of the alternating current is high. Letters of a Radio-Engineer to His Son This investigation, then, it goes without saying, deals with alternating currents, and, to be more precise, with alternating currents of high potential and high frequency. Experiments with Alternate Currents of High Potential and High Frequency The alternating current comes in on the wires as shown, and the direct current is taken from the point indicated. The Boy Mechanic: Volume 1 700 Things for Boys to Do They have firebrick furnaces, you understand, sir, with an alternating current of 5000 volts between water-cooled copper electrodes. The Air Trust Certain simplifications in the use of single-phase alternating currents in traction motors have increased the number of roads using a system of alternating-current power supply. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. That’s exactly the picture also of the successive positions of an electron in a circuit which is “carrying an alternating current.” Letters of a Radio-Engineer to His Son The case is thus analogous to that in which a condenser shunted by a conductor of low resistance is connected to a source of alternating currents. Experiments with Alternate Currents of High Potential and High Frequency I therefore raise the resistance, by sending an intermittent or an alternating current though the cells, and in their new condition they at once become extremely sensitive to light, currents, and other influences. Scientific American Supplement, No. 492, June 6, 1885 This is the action occurring in any induction coil whose primary wire is traversed by alternating currents, and whose secondary wire is closed either upon itself directly or through a resistance. Scientific American Supplement, No. 601, July 9, 1887 Fluctuating currents generated by the transmitter at the calling station, for instance, are converted by means of the induction coil into alternating currents flowing in the secondary of the induction coil at that station. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. An alternating current in one will give rise to an alternating current in the other. Letters of a Radio-Engineer to His Son In operating an induction coil with rapidly alternating currents, we realize with astonishment, for the first time, the great importance of the relation of capacity, self-induction and frequency as regards the general result. Experiments with Alternate Currents of High Potential and High Frequency An alternating current also produces a sound corresponding to the number of changes of direction. Scientific American Supplement, No. 492, June 6, 1885 The forms and relations of the two parts, C and B, may be greatly modified, with the general result of a preponderance of repulsive action when the alternating currents circulate. Scientific American Supplement, No. 601, July 9, 1887 How does a conductor behave in connection with direct current and how with alternating current? Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Usually we call the first coil, that is the one through which the alternating current flows, the “primary” and the second coil, in which a current is induced, the “secondary.” Letters of a Radio-Engineer to His Son Of the various branches of electrical investigation, perhaps the most interesting and immediately the most promising is that dealing with alternating currents. Experiments with Alternate Currents of High Potential and High Frequency One of the annexed cuts represents a Corliss steam engine connected directly with an alternating current machine of the system under consideration. Scientific American Supplement, No. 446, July 19, 1884 The actions produced and producible by the agency of alternating currents of considerable energy are assuming greater importance in the electric arts. Scientific American Supplement, No. 601, July 9, 1887 A condenser is used in series with a polarized ringer for the purpose of letting through alternating current for ringing the bell, and of preventing the flow of direct current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This alternating current induces in the secondary an e. m. f. which has the same variations as this current. Letters of a Radio-Engineer to His Son As in nature all is ebb and tide, all is wave motion, so it seems that; in all branches of industry alternating currents—electric wave motion—will have the sway. Experiments with Alternate Currents of High Potential and High Frequency It is in reality a minute rectifier of alternating current, and analogous to those which have since been made on a large scale. Edison, His Life and Inventions Thus far I have applied the repulsive action described in the construction of alternating current indicators, alternating current arc lamps, regulating devices for alternating currents, and to rotary motors for such currents. Scientific American Supplement, No. 601, July 9, 1887 If the frequency be infinite, the reactance is infinite, i.e., the circuit is "open" to the alternating current and that current cannot pass through it. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A transformer is two separate coils coupled together so that an alternating current in the primary will induce an alternating current in the secondary. Letters of a Radio-Engineer to His Son I took a magneto off an old car and changed the wiring in the inside so it would put out an alternating current instead of a jump spark. The Life of Me; an autobiography The invention is in universal use today, alike for direct and for alternating current, and as well in the equipment of large buildings as in the distribution system of the most extensive central-station networks. Edison, His Life and Inventions The electro-inductive repulsive action has also been applied to regulating devices for alternating currents, with the details of which I cannot now deal. Scientific American Supplement, No. 601, July 9, 1887 His method is to introduce an induction coil between the line and the transmitter, its function being to translate the variation of the direct current controlled by the transmitter into true alternating currents. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. When we use an audion as an amplifier of an alternating current we send the current which is to be amplified through the primary of a transformer, as in Fig. Letters of a Radio-Engineer to His Son In order to make comparative tests, the same apparatus may be supplied with continuous instead of alternating currents. Scientific American Supplement, No. 447, July 26, 1884 In the alternating current machine the slots on the opposite faces are face to face. Scientific American Supplement, No. 392, July 7, 1883 CC' are the field coils or inducing coils, which alone are put into the alternating current circuit. Scientific American Supplement, No. 601, July 9, 1887 An interrupted or alternating current of proper frequency and amount will produce in it a musical tone which can be heard throughout a large room. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. It is perhaps the most interesting because it is always more or less troublesome whenever a pair of wires is used to transmit an alternating current. Letters of a Radio-Engineer to His Son Recently, Mr. Pilleux has addressed to us some new experiments on the same subject, made on the voltaic arc produced by a De Meritens alternating current machine. Scientific American Supplement, No. 344, August 5, 1882 They are supplied by a Siemens alternating current machine and arranged in four circuits, on each of which are mounted four lamps in series. Scientific American Supplement, No. 362, December 9, 1882 Here we have, then, a means of inducing direct currents from alternating currents. Scientific American Supplement, No. 601, July 9, 1887 The degree to which the condenser allows alternating currents to pass while stopping direct currents, depends on the capacity of the condenser and on the frequencies of alternating current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This form is known as alternating current, as opposed to direct current, in which there is no changing of positive and negative. Oxy-Acetylene Welding and Cutting Electric, Forge and Thermit Welding together with related methods and materials used in metal working and the oxygen process for removal of carbon It will be guessed from what has been previously said on the subject of induction that the currents from such an electro-magnetic machine would be alternating currents, the impulses succeeding each other in alternate directions. Steam, Steel and Electricity The wonderful growth of the commercial applications of alternating currents during the past few decades would have been impossible without the use of the alternating-current transformer. Beacon Lights of History, Volume 14 The New Era; A Supplementary Volume, by Recent Writers, as Set Forth in the Preface and Table of Contents An alternating current whose frequency is low enough to operate a telephone receiver and, hence, which can be heard by the ear. The Radio Amateur's Hand Book It is not known that there is any frequency of alternating current which it is not capable of producing and translating. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The alternating current is not adapted to reproduce speech, but the ordinary direct current is. The Dream Doctor Some machines are made to supply alternating currents, others continuous currents. The Story of Electricity The alternating current from the automatic dynamo has become crossed with direct current from the big storage battery in a funny way. Tom Swift and His Great Searchlight; or, on the border for Uncle Sam An apparatus for changing alternating current into pulsating direct current. The Radio Amateur's Hand Book Here is a means of isolation so far as direct current is concerned, with complete communication for alternating current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. I'll use an alternating current on the third wire, and see if that makes it any better. Tom Swift and His Photo Telephone or the Picture That Saved a Fortune There are numerous types of electric motor as of the dynamo in use, but they are all modifications of the simple continuous or alternating current dynamo. The Story of Electricity At the same time with these developments the value of the alternating current came to be recognized. The Age of Invention : a chronicle of mechanical conquest This is graphically shown by the curve of the wave form of the alternating current and the oscillations that are set up by the positive part of it in Fig. The Radio Amateur's Hand Book One revolution of the loop, therefore, results in a complete cycle of alternating current consisting of one positive followed by one negative impulse. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The motor generator consisted of one alternating current motor driving two direct current generators. Tom Swift and His Electric Locomotive, or, Two Miles a Minute on the Rails There is some prospect of the luminosity excited in a vacuum tube by the alternating currents from a dynamo or an induction coil becoming an illuminant. The Story of Electricity Perhaps the chief American inventor in the domain of the alternating current is Elihu Thomson, who began his useful career as Professor of Chemistry and Mechanics in the Central High School of Philadelphia. The Age of Invention : a chronicle of mechanical conquest Heating the Filament with Alternating Current.—Where an alternating current power transformer is used to develop the necessary plate voltage a second secondary coil is generally provided for heating the filament of the oscillation tube. The Radio Amateur's Hand Book All the foregoing leads to the generalization that the higher the frequency, the greater the opposition of an inductance to an alternating current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. "Bless my alternating current!" cried the eccentric gentleman. Tom Swift and His Electric Locomotive, or, Two Miles a Minute on the Rails With the selection of electricity another question arose as to the expediency of employing continuous or alternating currents. The Story of Electricity Another great protagonist of the alternating current was George Westinghouse, who was quite as much an improver and inventor as a manufacturer of machinery. The Age of Invention : a chronicle of mechanical conquest ALTERNATOR.—An electric machine that generates alternating current. The Radio Amateur's Hand Book The alternating currents flowing in the primary of the coil induce currents in the secondary of the coil which supplement and augment the fluctuations produced by the direct action of the transmitter. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. A regular station had to be built for receiving the electricity in a 100,000-volt alternating current and delivering it to the locomotive in a 3,000-volt direct current. Tom Swift and His Electric Locomotive, or, Two Miles a Minute on the Rails A high tension alternating current thus can be transmitted over considerable distances and then transformed into direct current which flows along the trolley wires and is utilized in the motors. The Story of Electricity The first extensive use of the alternating current was in arc lighting, where the higher potentials could be employed on series lamps. The Age of Invention : a chronicle of mechanical conquest Don't buy a motor-generator set if you have commercial alternating current in your home. The Radio Amateur's Hand Book These variations induce similar alternating currents in the secondary of this coil, which is in series in the line circuit. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Don't connect a source of alternating current direct to your storage battery. The Radio Amateur's Hand Book In Europe alternating current has been used with great success and also in the United States where a number of lines have been equipped with this form of power. The Story of Electricity All of these transformers operate on 110 volt, 60 cycle current and can be connected directly to the source of alternating current. The Radio Amateur's Hand Book A condenser also has a reactance effect on an alternating current but different from an induction coil the lower the frequency the greater will be the reactance. The Radio Amateur's Hand Book Ammeters used for measuring direct and alternating currents make use of the magnetic effects of the currents. The Radio Amateur's Hand Book This is because oscillations are set up only when the plate is energized with the positive part of the alternating current and this produces an intermittent musical tone in the headphones. The Radio Amateur's Hand Book The two fundamental systems for electric railways, as in other power problems, are the direct current and the alternating current. The Story of Electricity Whenever the positive half of the alternating current energizes the plate then oscillations are set up by the tube and, conversely, when the negative half of the current charges the plate no oscillations are produced. The Radio Amateur's Hand Book COIL, INDUCTION.—An apparatus for changing low voltage direct currents into high voltage, low frequency alternating currents. The Radio Amateur's Hand Book Where a wire is wound in a coil the impedance of the circuit is increased and where an alternating current is used the impedance grows greater as the frequency gets higher. The Radio Amateur's Hand Book In this chapter will be shown how to use a direct current for your source of initial power and in the next chapter how to use an alternating current for the initial power. The Radio Amateur's Hand Book The current on lines of any considerable length is alternating current, supplied from large central generating stations and transformed to direct as occasion may demand at suitable sub-stations. The Story of Electricity To charge a condenser a spark coil or a transformer is used and the ends of the secondary coil, which delivers the high potential alternating current, are connected with the condenser. The Radio Amateur's Hand Book Don't fail to use alternating current for heating the filament where this is possible. The Radio Amateur's Hand Book The operation of a transmitting set that uses an alternating current transformer, or power transformer, as it is sometimes called, is even more simple than one using a spark coil. The Radio Amateur's Hand Book This kind of a rotary spark-gap is called non-synchronous and it is generally used where a 60 cycle alternating current is available but it will work with other higher frequencies. The Radio Amateur's Hand Book Power.—A transformer for stepping down a commercial alternating current for lighting and heating the filament and for stepping up the commercial a.c., for charging the plate of a vacuum tube oscillator. The Radio Amateur's Hand Book |
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