| 单词 | direct current |
| 例句 | And of course Edison urged the fair to use direct current, DC, the prevailing standard. The Devil in the White City 2003-02-11T00:00:00Z Nine EU governments – including the UK – are already planning to build an advanced high-voltage, direct current network within the next decade. Can Europe import solar power from Africa? 2010-06-26T23:13:00Z 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 Why is Thomas Edison’s concept of direct current used for the subway’s third rail? Museum Review: New York Transit Museum 2011-12-15T23:03:45Z 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 But what is the advantage of direct current in the subway? Museum Review: New York Transit Museum 2011-12-15T23:03:45Z 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 Tesla’s Supercharger network is coveted by other automakers because it has more direct current fast-charging plugs in the U.S. than any other network, and its stations are in prime locations along freeway travel corridors. Toyota will join Tesla’s electric vehicle charging network and adopt Tesla connector in future EVs 2023-10-19T04:00:00Z Both produce a direct current that can be converted into electricity immediately or stored in batteries for future use. Plenty of sunshine for solar panels and tiles in Seattle area | Provided by Pro Roofing NW 2023-09-21T04:00:00Z 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 A: Many of those quarter-million dollar examples, for example, are now zero because of testifying in front of public utility commissions to have rate reform to support direct current fast charging. Electrify America charging network must navigate patchwork of utility rates, government regulations 2023-09-18T04:00:00Z 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 Most are not the direct current fast chargers needed to quickly refill batteries. Stellantis is signing up EV charging companies to assemble its own network, won’t comment on Tesla 2023-06-27T04:00:00Z Tesla’s Superchargers are coveted by other automakers because it has more direct current fast-charging plugs in the U.S. than any other network, and its stations are in prime locations along freeway travel corridors. Tesla’s EV plug is closer to becoming the industry standard following a move by an automotive group 2023-06-27T04:00:00Z Tesla has more direct current fast-charging plugs in the U.S. than any other network, and its stations are in prime locations along freeway travel corridors. Electric vehicle maker Rivian to join Tesla charging network as automakers consider company’s plug 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 Fast chargers use direct current and charge electrical vehicles more quickly, but may diminish battery life if used regularly, said Seattle City Light spokesperson Jenn Strang. Where Seattle will build 31 new curbside chargers for electric cars 2023-03-24T04:00:00Z Tesla’s Superchargers are coveted by other automakers because the company has more direct current fast-charging plugs in the U.S. than any other network, and its stations are in prime locations along freeway travel corridors. Stellantis is signing up EV charging companies to assemble its own network, won’t comment on Tesla 2023-06-27T04:00:00Z The passage of a direct current through the cell causes the sodium ions to migrate to the negatively charged cathode and pick up electrons, reducing the ions to sodium metal. Chemistry 2019-02-14T00:00:00Z What if alternating-current inventor Nikola Tesla came forward in time and discovered that the cars named for him run on direct current? Style Invitational Week 1501: Try a little ‘kindness’ 2022-08-11T04:00:00Z 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 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 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 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 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 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 The best graphene was made by using a combination of alternating and direct current. Plastic trash can now be recycled into ultra-strong graphene 2021-02-23T05:00:00Z Among them, in the early 1960s, was the development of a defibrillator that used direct current to reestablish a normal heartbeat when an arrhythmia occurs. Bernard Lown, physician who rallied doctors against nuclear war, dies at 99 2021-02-17T05:00:00Z They will be part of a network of direct current fast chargers the agency is partially funding as part of its Charge Up Michigan Program. Grants awarded for more electric vehicle charging stations 2020-12-20T05:00:00Z 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 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 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 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 Edison thought that his own direct current method would be seen as superior if Westinghouse’s AC voltage was associated with a barbaric killing method. New films 'Just Mercy' and 'Clemency' put the death penalty on trial 2019-12-27T05:00:00Z 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 However, Earth's currents are driven by direct currents, whereas Jupiter's are not. Mysterious alternating currents found on Jupiter 2019-07-17T04:00:00Z Los Angeles could also upgrade its converter station at Intermountain — which transforms electricity from alternating to direct current — with “voltage source” technology better suited for transmitting renewable energy. Los Angeles is finally ditching coal — and replacing it with another polluting fuel 2019-07-16T04:00:00Z 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 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 Two follow-up studies conducted by other teams were also able to influence lying using direct current, although they used different experimental setups and target brain regions. The Art of Lying 2018-07-11T04:00:00Z And he relates the nineteenth-century battle of alternating and direct currents between Thomas Edison and George Westinghouse. The triumphs and tragedies in energy history 2018-05-07T04:00:00Z 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 Transcranial direct current stimulation has been claimed to enhance learning.Credit: The wilder shores of brain boosting 2018-02-06T05:00:00Z The only electrical connection between the Texas grid and the other U.S. grids is direct current lines that carry relatively little power. Texas Got 18 Percent of Its Energy from Wind and Solar Last Year 2018-02-04T05:00:00Z This is then converted into direct current by a rectifier, and is used to top up the vehicle’s battery. It is now practical to refuel electric vehicles through thin air 2017-10-26T04:00:00Z In a motor using direct current, which comes from a battery, the switching is done with a commutator, a type of mechanical switch. As electric motors improve, more things are being electrified 2017-09-14T04:00:00Z One obvious way of avoiding the flicker is to operate the lamps with a direct current so the light is constant, but this involves more expensive, shorter-lived components. The Scientific Reason You Don't Like LED Bulbs — and the Simple Way to Fix Them 2017-08-01T04:00:00Z Technology for power transmission advanced in the 1970s, allowing direct current to return as a viable option—and for lines more than 300 to 500 miles long, DC outcompetes AC. A Comeback for Electricity Tech Once Championed by Thomas Edison 2017-06-12T04:00:00Z But the ultra-high voltages required for transcontinental transmission are still best achieved with direct current. Electricity now flows across continents, courtesy of direct current 2017-01-12T05:00:00Z Will it be direct current, backed by the political and economic clout of Thomas Edison? New crime fiction from Oscar-winning screenwriter, comic-caper master and more 2016-09-11T04:00:00Z 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 Itch passes through our bodies in direct currents, as if from ancient history; sex and pain enter our lives communally, loaded with the local news. What the Science of Touch Says About Us 2016-05-16T04:00:00Z 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 When it flows as direct current, there is no oscillation. Electricity now flows across continents, courtesy of direct current 2017-01-12T05:00:00Z He said there are two high-voltage direct current transmission lines in the state, and that there aren’t many of these lines in the United States. North Dakota State to research new system for wind power 2016-01-31T05:00:00Z The Tesla fast-charging system delivers up to 130 kilowatts of direct current, allowing for a speedy charge of the car’s large battery. Tesla Delivers 17,400 Vehicles in Fourth Quarter 2016-01-03T05:00:00Z A direct current is then applied between the lead plates and stainless steel, causing the copper ions in the electrolyte solution to attach themselves onto the sheets. Solar Power Lights the Way to a Cleaner Economy in Chile 2015-10-08T04:00:00Z In a bid to compete better with the likes of Tesla, Volkswagen is now teaming up with BMW to build 100 direct current fast charging ports across the U.S. this year. Volkswagen's Push For Electric Vehicles Gains Further Momentum 2015-01-29T05:00:00Z “The third rail is high-voltage direct current, and if that current starts arcing to another conductor that it is not designed to connect with, you get a flash,” Flanigon said. DC subway system remains hobbled after fatal incident 2015-01-13T05:00:00Z He said this requires longer transmission lines to get power to more highly populated areas, and that direct current transmission is more economical for long distances. North Dakota State to research new system for wind power 2016-01-31T05:00:00Z But when he heard that 200-foot-tall transmission towers carrying the high-voltage direct current power lines were to be planted across the lush river valley and over his home, he joined the movement to stop them. Germans Balk at Plan for Wind Power Lines 2014-12-24T05:00:00Z The Rock Island project is still in the early stages and must piece together land parcels from hundreds of landowners across the state in order to build the 150-foot tall direct current lines. Clean Line's wind-power superhighway approved in Illinois 2014-11-25T05:00:00Z 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 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 Rather than capturing incoming visible light like a conventional solar photovoltaic panel, Capasso wants to generate direct current electric power by emitting infrared light. The Extremely Strange Solar Energy Technology You'd Be Stupid To Ignore 2014-03-04T01:59:00Z When the material is exposed to light, electrical charges are generated and conducted away by metal contacts as direct current. Patent Map Reveals Rise Of Thin-Film Solar Technology 2014-01-26T23:52:00Z Transmission Developers said it would use high-voltage direct current technology for the line, which the PSC said would be like a big extension cord from Quebec to New York City. New York approves 1,000-MW Quebec-New York City power line 2013-04-18T20:01:52Z Transmission Developers said it would use high voltage direct current technology for the line, which the PSC said would be like a big extension cord from Quebec to New York City. New York OKs 1,000-MW Quebec-New York City power line 2013-04-18T17:45:08Z This would meet all the local needs and also allow huge amounts of power to be exported to Europe via high-voltage direct current cables under the Mediterranean sea. Desert solar power plan in doubt 2012-11-19T03:34:12Z The proposed transmission cable would use direct current, which is considered more reliable. Merits of Power Line From Quebec to New York City Are Debated 2012-08-20T01:17:46Z 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 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 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 It is interested in learning how to use high-voltage direct current cables such as those proposed for bringing power across the Mediterranean. Desert solar power plan in doubt 2012-11-19T03:34:12Z Yes, he fought tooth and nail for his belief that direct current was a better way to transmit electricity. Nikola Tesla Wasn't God And Thomas Edison Wasn't The Devil 2012-05-18T05:41:49Z This will undoubtedly be found the cheapest and most convenient way of converting 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 The condition may be present in thrombi which are exposed to a rapidly-flowing arterial stream, as well as in those which lie in venous pockets outside the course of the direct current of blood. A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases 2012-03-17T02:00:54.097Z 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 And, if they get the necessary permissions from the United Kingdom’s government, the firm plans to lay high-voltage direct current cable across Ireland and under the Irish Sea to supply power to the that country. Massive Energy Storage, Courtesy of West Ireland 2012-02-18T19:16:04Z 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 The magnet is employed with special advantage in the conversion of direct currents, as it is then very effective. 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 arc is produced by the direct current from a battery. Scientific American Supplement, No. 648, June 2, 1888. 2011-12-26T03:00:15.410Z 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 The American inventor, who made the incandescent light bulb viable for the mass market, also built the world's first electrical distribution system, in New York, using "direct current" electricity. Insight: How renewable energy may be Edison's revenge 2011-12-20T11:16:32Z Baxter, Jr. The business end of any dynamo or motor of the direct current type is the commutator. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z A form of such discharger with a magnet which has been found convenient, and adopted after some trials, in the conversion of direct currents particularly, is illustrated 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 And these alternating and oscillating currents need to be measured just as the direct currents do. 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 How is direct current obtained in a dynamo? 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 From data centers to long-distance power lines and backup power supplies, direct current is proving useful in thousands of projects worldwide. Insight: How renewable energy may be Edison's revenge 2011-12-20T11:16:32Z What similarity does the test for induced current show between movement through a magnetic field and the making and breaking of a direct current? Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z 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 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 Explain in detail how direct current is obtained in a dynamo. 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 AT&T adopted direct current for the phone system because of its inherent stability, which is part of the reason that landline phones often survive storms better than the electric grid. Direct Current Technology Gets Another Look 2011-11-17T23:57:26Z 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 Consider first the direct current conversion; Ia represents the simplest case. 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 Patients in the medical management arm received antiarrhythmic drug changes and direct current cardioversions to achieve and maintain sinus rhythm, and were followed at 1, 3 and 6-months. TTOP-AF Trial Demonstrates Efficacy of RF Ablation System, But Fails To Prove Safety 2011-10-10T20:49:51Z It will be easily seen by the aid of a series of illustrations just how the alternating armature currents are transformed into 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 On the next day I reversed the current; the pain stopped after three minutes' galvanization; it did not recur for four days, during which time, however, I continued the daily use of the direct current. Neuralgia and the Diseases that Resemble it 2011-10-03T02:00:31.460Z The Einthoven string galvanometer is another form of sensitive instrument for the measurement of small direct currents. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The field-coils are thrown into circuit with the direct current source when the main switch is shifted. 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 High voltage direct current transmission cost more than twice that. How Merkel Decided to End Nuclear Power 2011-08-13T14:06:17Z 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 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 direct current of his thoughts pointed, however, in the direction of the invalid. The Kentuckian in New-York, Volume I (of 2) or, The Adventures of Three Southerns 2011-07-06T02:00:46.297Z An interesting method devised by Mr. Tesla for the regulation of direct current dynamos, is that which has come to be known as the "third brush" method. 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 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 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 The new line would have a direct current, meaning the flow of power can be controlled at any time. 'Saudi Arabia of Wind' Has Trouble Figuring Out How to Get the Power Out 2011-04-05T18:15:00.463Z As the magnet was vibrated, stationary nodes were produced in the steel rods, and at these points the terminals of a direct current source were attached. 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 can be used for driving dynamos as well as any, and as nearly all the power developed at the Falls is used in this way no provision is made for a direct current. The Niagara River 2011-02-08T03:00:09.703Z Is the direct current indicated by the sine curve in figs. 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 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 Well, to return to the more or less—chiefly less—direct current of my tale, after my sojourn in the southern suburb came a return to the country, where I remained eight or nine months. Far Off Things 2011-02-04T03:00:19.967Z In fact he expressed the hope that these currents would be capable of application in many instances, serving as 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 Where a direct current is desired the electricity is made to drive a dynamo of the alternating type which in turn is made to drive another of the kind of current desired. The Niagara River 2011-02-08T03:00:09.703Z 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 In the Thury system of power transmission high-voltage direct current is used throughout. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z 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 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 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 Much of the cost in each case is to transform the electricity to direct current, a form that is easier to use in buried cables. A Power Line Runs Through It 2010-03-17T02:07:00Z 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 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 A large disc-shaped rectifying antenna attached to the fuselage harvested the microwave energy, turning it into direct current to power an electric motor attached to the plane’s propeller. Cutting the clutter 2010-03-12T09:45:00Z 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 Two recent proposals for a centrally planned overhaul of the North American electric grid called for heavy use of direct current. A Power Line Runs Through It 2010-03-17T02:07:00Z 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 Because of the condensers serially in the telephone line, voice currents can pass through it, but direct currents can not. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Power is supplied to the coils by two motor generator sets, which produce the direct current required for a steady magnetic field. LRL Accelerators The 184-Inch Synchrocyclotron This current goes through the coil and is rectified—that is, it's turned into pulsating direct current—by the razor blade. The Blue Ghost Mystery He had the men string up a line from our direct current generator in the shops, to supply power for his electrical instruments. Astounding Stories, March, 1931 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 Three of these smaller machines are for supplying ringing current and the remainder are for supplying 30-volt direct current for operating the message registers. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The direct current from the motor generators is regulated so that the magnetic-field fluctuation is less than one part in 10,000. LRL Accelerators The 184-Inch Synchrocyclotron Charging Outfit, such as a motor-generator set, rectifier, or charging resistance where direct current is available. The Automobile Storage Battery Its Care And Repair Name three uses of the direct current, and tell how it differs from the alternating current. Boy Scouts Handbook The First Edition, 1911 For charging storage batteries and making electromagnets, separating water into two gases, and for running certain kinds of motors, however, the direct current is necessary. Common Science 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. High-pressure direct current is not easily generated, since the sparking at the collecting brushes as they pass over the commutator segments gives trouble. 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 Two things are therefore necessary in charging a battery: We must have a source of direct current. The Automobile Storage Battery Its Care And Repair "We must not forget the difference between alternating and direct current, my boy," said the Phoenix as it flew down again. David and the Phoenix If you do not have direct current in the laboratory, attach the copper wires to the two poles of a battery instead. Common Science The meters usually are voltmeters and ammeters, the former being adapted to read the several voltages of direct currents in the power plant. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. In arc lamps fed with direct current the tip of the positive carbon has a bowl-shaped depression worn in it, while the negative tip is pointed. 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 A battery is charged by sending a direct current through it, this "charging" current entering the battery at, the positive terminal and passing out at the negative terminal. The Automobile Storage Battery Its Care And Repair A direct current dynamo and a direct current motor are identical in construction. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine I saw it working when it was connected with an apparatus carrying about fifteen thousand volts of electricity in a direct current. The Radio Boys Trailing a Voice or, Solving a Wireless Mystery The method most widely used is to equip the waystations with magneto generators which produce direct currents only; such a generator cannot operate a polarized ringer. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Why," it may be asked, "should we not send low-pressure direct current to a distant station straight from the dynamo, instead of altering its nature and pressure? 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 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 To charge such a battery on a 110-volt direct current, it is necessary to install some means of limiting the amount of current, or in other words, the charging rate. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The first machines of Gramme, therefore, furnished direct currents, similar to those yielded by the voltaic pile. Fragments of science, V. 1-2 In some cases commercial direct current is used to charge the storage batteries without the intervention of the translating devices, resistances being used in series with the battery to regulate the amount of current. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. An electric motor, powered either from the REA line or from direct current stored in a bank of wet cell batteries, bulked large in the small shed. Make Mine Homogenized Passing direct current through a battery in the direction opposite to that of discharge, in order to put back the energy used on discharge. The Automobile Storage Battery Its Care And Repair Alternating current will light the same lamps and heat the same irons as a direct current; but for electric power it requires a different type of motor. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine But the photometric observations, in which the external resistance was abolished, and previous to which the light-keepers had become more skilled in the management of the direct current, showed the differences recorded in the table. Fragments of science, V. 1-2 Commercial direct current usually is available at pressures from 110 volts and upward, while telephone power plants contain storage batteries rarely of pressures higher than 50 volts. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The virus is but moderately volatile, and in a stable seems rather to follow the lines of the walls and irregular courses than the direct currents of air and the tracts of ventilation. Special Report on Diseases of the Horse Apparatus for converting alternating current into direct current. The Automobile Storage Battery Its Care And Repair A direct current dynamo Unless this dynamo were properly protected, the effect of such a catastrophe would be immediate and probably irreparable. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine 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 It is to be understood, however, that the conversion may be from direct current to direct current, from alternating to direct, or from direct to alternating. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. An induction coil in an alternating circuit for changing potential difference, such as high alternating voltage into low direct current voltage. Electricity for Boys Electric current which does not flow in one direction only, like direct current, but rapidly reverses its direction or "alternates" in polarity so that it will not charge a battery. The Automobile Storage Battery Its Care And Repair Electric Motor.—The direct current electric motor depends for its action on the principle that likes repel, and unlikes attract. Practical Mechanics for Boys A small machine furnishes a direct current, which is carried round the electro-magnets of a second and larger machine. Fragments of science, V. 1-2 There are three available methods of supplying direct current for talking and signaling purposes to private branch exchanges, each of which represents good practice under certain conditions. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. Wires offer resistance, or they impede the flow of a current, as hereinbefore stated, so that it is not economical to transmit a direct current over long distances. Electricity for Boys Where no direct current supply is available, a motor-generator or a rectifier must be installed. The Automobile Storage Battery Its Care And Repair But the latter causes which I have named are modifying causes which tend to counteract, or rather to deflect and direct currents in their flow. Shifting Winds A Tough Yarn A long fall across the direct current of the River is known as the Horseshoe Fall. The Ferryman of Brill and other stories 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. A current which goes back and forth in opposite directions, unlike a direct current which flows continuously in one direction over a wire. Electricity for Boys 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 What before was close and narrow, was then widened and rendered pervious to a direct current of air. Travels through the South of France and the Interior of Provinces of Provence and Languedoc in the Years 1807 and 1808 Liquid rheostats are ever so much more satisfactory for alternating than for direct current testing. Scientific American Supplement, No. 1157, March 5, 1898 It is transmitted and used as direct current, our generator and motors being so constructed that they can produce no etheric disturbances capable of penetrating the shielding walls of our city. Spacehounds of IPC Direct Current.—When a current of electricity is generated by a cell, it is assumed to move along the wire in one direction, in a steady, continuous flow, and is called a direct current. Electricity for Boys It should, however, be used only where direct current lighting circuits are available. The Automobile Storage Battery Its Care And Repair All our transmission is done at high voltage direct current. Invaders from the Infinite At the distance of fourscore miles from the Persian Gulf, the Euphrates and Tigris unite in a broad and direct current. The Arabian Nights Entertainments Thus we see that while Mr. Redfield concedes to Mr. Espy a spirally inward current, the latter also gives up a direct current to the centre, to Mr. Redfield. Outlines of a Mechanical Theory of Storms Containing the True Law of Lunar Influence This direct current is a natural one if generated by a cell. Electricity for Boys As the arc burns the carbons waste away and in the case of direct current, the positive decreases in length more rapidly than the negative one. Artificial Light Its Influence upon Civilization I feared it might be alternating—but we can handle direct current. Invaders from the Infinite The switches of the direct current circuits are hand-operated and are located upon boards at the right and left of the control board. 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 It will be seen that only the expansive force of the gas, together with its buoyancy, acts upon the jets, instead of a direct current. Lippincott's Magazine of Popular Literature and Science, Vol. XVI., December, 1880. 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. Yet in my father's notebook I find this suggestive sentence: "It seems possible to devise an apparatus which would deliver from an alternating circuit a direct current to a direct current circuit." The Certainty of a Future Life in Mars This section is equipped with four tracks, and the contact rail for each track, together with the direct current feeders which supply it from sub-stations Nos. The New York Subway Its Construction and Equipment The motor can be run on a 110-volt direct current, but a resistance must be placed in series with it. The Boy Mechanic: Volume 1 700 Things for Boys to Do Here we have, then, a means of inducing direct currents from alternating currents. Scientific American Supplement, No. 601, July 9, 1887 If direct current be flowing in one of the windings, and remains constant, no current whatever is produced in the other. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. As the distance of fourscore miles from the Gulf, the Euphrates and Tigris unite in a broad and direct current, which is aptly styled the river of the Arabs. History of the Decline and Fall of the Roman Empire — Volume 5 Of each pair of track rails one is used for the automatic block signaling system, and, therefore, is not used as a part of the negative or return side of the direct current system. The New York Subway Its Construction and Equipment 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 It could not be used for electroplating or deposition, nor could it charge storage batteries, all of which are easily within the ability of the direct current. Edison, His Life and Inventions Electrical power is supplied to single-trolley railroads principally in the form of direct current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. While the coil was approaching the lines of force were increasing, and a momentary inverse current was set up, which was immediately succeeded by a momentary direct current as the coil receded from the pole. Scientific American Supplement, No. 324, March 18, 1882 The other four track rails, however, are bonded, and together with the negative feeders constitute the track return or negative side of the direct current system. The New York Subway Its Construction and Equipment 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 Here it is a Diesel, started by President Wilson by wireless on the opening day, and generating all the direct current used in the palace. The Jewel City All electric roads do not use direct current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The second method is an efficient one, as the direct current is varied before it passes into the oscillator tube. The Radio Amateur's Hand Book The lights on the engines and those at gauge glasses and water columns and at the pumps are supplied by direct current from the 250-volt circuits. The New York Subway Its Construction and Equipment The alternating current is not adapted to reproduce speech, but the ordinary direct current is. The Dream Doctor 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 This permits the passage of voice currents, but not of the direct currents used in stepping the relays or in releasing them. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Filter Condenser.—A condenser of large capacitance used in combination with a filter reactor for smoothing out the pulsating direct currents as they come from the rectifier. The Radio Amateur's Hand Book These motor generators are driven by direct current from the third rail and deliver direct current of 25 volts. The New York Subway Its Construction and Equipment 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 It must not be inferred, however, that all electric railways employ direct current machinery. The Story of Electricity The reason its capacity for direct currents is increased at Page 314 all by flattening it, is that the surface for the radiation of heat is increased. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. An apparatus for changing alternating current into pulsating direct current. The Radio Amateur's Hand Book The patient may be protected by a screen, or a board may be placed across the lower part of the window in such manner that a direct current of air upon the patient is prevented. Nature Cure Did this to search for a more direct current, but found none so favorable as the one we are now in. The Works of Edgar Allan Poe — Volume 1 But the greater number of installations employ the direct current at about 500-600 volts and this is now the usual practice. The Story of Electricity However, when enclosed in a tube, radiation of heat is limited, so that for direct currents the carrying capacity of fuses varies closely with the area of cross-section. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. As these oscillations surge through the tube the positive parts of them flow from the plate to the filament and these carry more of the direct current with them. The Radio Amateur's Hand Book It had got into the direct current and was being swept down the river. Michael Strogoff Or, The Courier of the Czar Civilisation sets in direct currents towards the streets and marts of Turin. Rienzi, Last of the Roman Tribunes The two fundamental systems for electric railways, as in other power problems, are the direct current and the alternating current. The Story of Electricity 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. The Filter Condensers.—These condensers are used in connection with the reactance coil to smooth out the pulsating direct current after it has passed through the rectifier tube. The Radio Amateur's Hand Book 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 Open-Circuit:—Where very feeble currents are being dealt with, and particularly where there is no flow of direct current, an open magnetic circuit is much used. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. These high voltage direct current lines were first used in Europe, and during the year 1907 experimental lines on the Vienna railway were tested. The Story of Electricity 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. REACTOR, FILTER.—A reactance coil for smoothing out the pulsating direct currents as they come from the rectifier. The Radio Amateur's Hand Book 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 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. With the polyphase current a motor with a rotating field is used, and they have considerable efficiency as regards weight when compared with the single phase and with the direct current motor. The Story of Electricity If the frequency be zero, the reactance is infinite, i.e., the circuit is open to direct current. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. This is better than a direct current for it adds to the life of the filament. The Radio Amateur's Hand Book This divided circuit arrangement employed by the Kellogg Company is one of the very simple ways of eliminating direct currents from the receiver path, at the same time allowing the free passage of voice currents. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. As a result, the receiver will be connected between two points of equal potential, and no direct current will flow through it. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Here the single phase motors use direct current while running over the tracks of the New York Central from Woodlawn to the Grand Central Terminal. The Story of Electricity If the frequency be zero, the reactance is zero, i.e., the circuit conducts direct current as mere resistance. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. For this reason both a filter reactor and filter condensers are used to smooth out the pulsating direct currents. The Radio Amateur's Hand Book Obviously, when placed in a circuit a condenser offers a complete barrier to the flow of direct current, since no conducting path exists between its terminals, the dielectric offering a very high insulation resistance. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Connect the protective condenser across the direct current feed wires between the panel cut-out and the choke coil. The Radio Amateur's Hand Book The negative part of the 110 volt direct current then flows down the other wire to the filament so that there is a difference of potential between the plate and the filament of 110 volts. The Radio Amateur's Hand Book 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. COIL, INDUCTION.—An apparatus for changing low voltage direct currents into high voltage, low frequency alternating currents. The Radio Amateur's Hand Book This rectifier tube delivers a direct current of 20 watts at 350 volts. The Radio Amateur's Hand Book You can, however, use 110 volt direct current from a lighting circuit as your initial source of power to energize the plate of the vacuum tube oscillator of your experimental transmitter. The Radio Amateur's Hand Book Where you have a 110 volt direct current lighting service in your home and you want a higher voltage for your plate, you will then have to use a motor-generator set and this costs money. The Radio Amateur's Hand Book The condenser or other capacity acts as an effective barrier to the steady flow of direct currents. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. CURRENT, PULSATING.—A direct current whose voltage varies from moment to moment. 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 A wiring diagram of the connections is shown at B. For Direct Current.—Where you have 110 volt direct current you must connect in an electrolytic interrupter. The Radio Amateur's Hand Book For this transmitter a direct current voltmeter reading from 0 to 15 volts is used. The Radio Amateur's Hand Book 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. The pulsating direct currents are then passed through a filtering reactance coil, called a reactor, and one or more condensers, and these smooth them out until they approximate a continuous direct current. The Radio Amateur's Hand Book To understand how oscillations are set up by a vacuum tube when a direct current is applied to it, take a look at the simple circuits shown in Fig. The Radio Amateur's Hand Book In wireless it is used for changing commercial direct current into direct current of higher voltages for energizing the plate of a vacuum tube oscillator. The Radio Amateur's Hand Book That a direct current arc light transforms a part of its energy into electric oscillations was shown by Firth and Rogers, of England, in 1893. The Radio Amateur's Hand Book The presence of the condenser precludes the possibility of direct current flowing in this path. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. |
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