| 单词 | ampere |
| 例句 | But you might not expect that the force between wires is used to define the ampere. College Physics for AP Courses 2015-08-12T00:00:00Z When the current in a circuit is 40 amperes, the resistance is 10 ohms. Algebra and Trigonometry 2015-02-13T00:00:00Z The ampere, the kelvin and the mole are redefined using other experiments. CRISPR-baby rules, fake-news law and kilogram retires 2019-05-21T04:00:00Z The ampere, the kelvin and the mole will be redefined using other experiments. Physical kilogram is officially dead 2019-05-19T04:00:00Z For example, the resistance per unit length of a channel carrying a current of 1 ampere is about 300 times that of a channel carrying 100 A3. A closer look at lightning reveals needle-like structures 2019-04-16T04:00:00Z You may need to look ahead to interpret manufacturer’s battery ratings in ampere- hours as energy in joules. College Physics for AP Courses 2015-08-12T00:00:00Z Such a field in turn requires an electrical current of 12,000 amperes. It’s Intermission for the Large Hadron Collider 2018-12-21T05:00:00Z One method of redefining the kilogram sprang from an effort to better realize the ampere, the standard measure of electrical current. The Kilogram Is Dead. Long Live the Kilogram! 2018-11-17T05:00:00Z The ampere, the kelvin and the mole will also be redefined based on their relationships to the charge on the electron, Boltzmann’s constant and Avogadro’s number, respectively. Daily briefing: Exoplanet spotted orbiting Barnard’s star 2018-11-15T05:00:00Z Along with the kilogram, three other units were also redefined: the ampere, Kelvin, and mole, all of which are now officially linked to constants of nature. Scientists say goodbye to physical definition of the kilogram 2018-11-16T05:00:00Z Electric current and its accompanying unit, the ampere, will be introduced in Introduction to Electric Current, Resistance, and Ohm's Law when electricity and magnetism are covered. College Physics for AP Courses 2015-08-12T00:00:00Z In their vote, countries also unanimously approved updates to three other key units: the kelvin for temperature, the ampere for electrical current and the mole for the amount of a substance. The Latest: Landmark change to kilogram approved 2018-11-16T05:00:00Z In total, four units will be given new definitions: the kilogram, the ampere, the kelvin, and the mole. Why we’re killing the kilogram for a new one 2018-11-13T05:00:00Z Electric current The ampere is defined in terms of the current required to generate a certain force between two wires set a metre apart. The future of the kilo: a weighty matter 2018-11-03T04:00:00Z And an imaginary experiment involving the force between two infinite wires defines the ampere, the unit of electrical current. New definitions of scientific units are on the horizon 2017-10-17T04:00:00Z An ampere is the flow of one coulomb through an area in one second. College Physics for AP Courses 2015-08-12T00:00:00Z What used to be an organized grid is now a tangle of wires suspended between buildings and street posts, providing those who pay with “ampere,” or amps. Perspective | The battle for Aleppo is over. I returned to my hometown to see what’s left. 2017-07-07T04:00:00Z Most homes require at least three amperes a month, Mr. Hasan said. Stuck Without Water in Mosul, Neighbors Find a Way 2017-02-16T05:00:00Z The unit costs about $1,400 and requires a specific electrical environment — the right wattage and amperes — which was noted in my online description of the product. Lesson From a Doughnut Fryer Debacle: Let the eBay Seller Beware 2016-07-30T04:00:00Z This will include a discussion of the draft resolution that is expected to redefine the ampere, mole, kelvin and kilogram at the General Conference on Weights and Measures in 2018. Kilogram conflict resolved at last 2015-10-13T04:00:00Z The operational definition of the ampere is based on the force between current-carrying wires. College Physics for AP Courses 2015-08-12T00:00:00Z The current of zero to 0.004 amperes is less than a fraction of the standard 110-volt household outlet that delivers 15 amps. Colonels assistant gets Tasered in morale-building stunt 2015-08-25T04:00:00Z The watt is the work per second done by an electromotive force of 1 volt in driving a current of 1 ampere, and is equal to 10 million ergs or 1 joule per second. Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 "Hearing" to "Helmond" 2012-04-25T02:00:53.567Z Owing to the great speed it was possible to obtain as high as 10 amperes out of the machine. 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 As the ten-inch coil takes a primary current of ten amperes at sixteen volts when in operation, it requires very substantial platinum contacts to withstand the interruption of this current continuously without damage. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z This is the basis of the operational definition of the ampere. College Physics for AP Courses 2015-08-12T00:00:00Z The pressure under which a current flows is measured in volts and the quantity that passes in amperes. 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 voltmeter is therefore the same as the ammeter, except that its dial is marked for volts instead of for amperes, and it has to be provided with the resistance 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 Fuses not of proper ampere rating for circuit—— 11. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z As the current to be interrupted amounts to about ten amperes and is flowing in a highly inductive circuit, the spark at break is considerable. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z We measure the charge that flows for a current of one ampere in one second. College Physics for AP Courses 2015-08-12T00:00:00Z Thus with 11⁄2 volt 15 ampere dry cells, the combination or battery connected as shown would give 4 × 15 = 60 amperes at a pressure of 11⁄2 volts. 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 And when one comes to consider that a micro-ampere is a millionth part of an ampere this is perfectly astounding. 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 A fraction of an ampere passing through your heart muscles can be fatal. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z The General Conference on Weights and Measures meets in Sèvres, near Paris, to discuss how to redefine the kilogram, ampere, kelvin and mole. Seven days: 13 October 2011 2011-10-12T17:20:21.333Z For both the ampere and the coulomb, the method of measuring force between conductors is the most accurate in practice. College Physics for AP Courses 2015-08-12T00:00:00Z EXAMPLE—A current of 42 amperes flows through three conductors in parallel of 5, 10 and 20 ohms resistance respectively. 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 But there is a more wonderful story still to come, of an instrument which can detect a millionth of a micro-ampere, or one millionth of a millionth of an ampere. 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 A fraction of an ampere through the human heart muscles can be fatal. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z Coulomb, koo-lom′, n. the unit of quantity in measuring current electricity: the quantity furnished by a current of one ampere in one second. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z It takes about half an ampere of current. The Story of Great Inventions 2011-10-05T02:00:16.353Z Again: 10 coulombs = 2 amperes × 5 seconds = 10 amperes × 1 second = 1 ampere × 10 seconds, etc. 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 To give a concrete example, if the pressure of your supply is 200 volts, and you take a current of five amperes for an hour, you will have consumed one B.T.U. 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 ampere is 6.3 billion electrons passing one point in a circuit, in one second. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z Pure iron is mixed with carbon obtained from the calcination of sugar, and the whole is rapidly heated in a carbon crucible in an electric furnace, using a current of 700 amperes and 40 volts. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5 "Gassendi, Pierre" to "Geocentric" 2011-09-02T02:00:20.450Z Turn on a hundred lamps connected to the same wires, and the dynamo of its own accord keeps the pressure the same, and supplies fifty amperes, or half an ampere for each lamp. The Story of Great Inventions 2011-10-05T02:00:16.353Z For instance, 2 amperes in 1⁄2 hour, or 4 amperes in 1⁄4 hour will also give one ampere-hour of 3,600 coulombs. 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 is the result of multiplying together volts and amperes. 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 What will be the heaviest load you are likely to put on the cord, in amperes? Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z Plans for the ampere's revision have long been in good shape because measurements of the electron's charge are very precise. Fundamental Physical Constants Get Updated Values 2011-07-27T01:45:03.507Z We do honor to the name of Ampère whenever we measure an electric current, for electric currents are measured in "amperes." The Story of Great Inventions 2011-10-05T02:00:16.353Z To illustrate further the difference between coulombs and amperes, the following example is given. 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 This region is called the magnetic field, and the strength of the field varies with the strength that is the number of amperes in the 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 No. 16 wire can carry 10 amperes safely for a distance of 50 feet, while No. 18 can carry only up to 7 amperes for a distance of 40 feet. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z These latter considerations of health, recreation, and esthetic delight are not less entitled to recognition because they cannot be measured in terms of board feet or amperes convertible into dollars and cents. Proceedings of the Second National Conservation Congress at Saint Paul, September 5-8, 1910 2011-05-07T02:00:26.100Z In this case a current density of 100 amperes at 1 volt is used. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z That is, magnetic flux = magnetomotive force / reluctance expressed in units, the equation becomes: maxwells = gilberts / oersteds The gilbert is the unit of magnetomotive force, equivalent to the magnetomotive force of .7958 ampere turn. 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 Thus the practical definition of the ampere is "that current which when passed through a solution of silver nitrate in water will deposit silver at the rate of �001118 gramme per second." 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 A draft resolution to be considered at the General Conference of Weights and Measures in October includes new and improved definitions for the ampere, the mole and the candela. S?vres Journal: Missing Micrograms Set a Standard on Edge 2011-02-12T19:20:21Z We are now charging on one engine, 500 amperes on each half-battery. The Diary of a U-boat Commander With an Introduction and Explanatory Notes by Etienne 2011-01-30T03:00:19.213Z 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 An ampere is the current produced by an E. M. F. of one volt in a circuit having a resistance of one ohm. 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 current used has a force comparable with that which operates domestic electric bells, but in volume it is thousands of amperes. 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 These expressions give the ampere value of the current which will bring bare, straight or loosely coiled wires of d mils in diameter to about 60� C. when the steady state of temperature is reached. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z I trimmed right down, hoping to avoid being seen, as it was essential to stay on the surface and get some amperes into the battery. The Diary of a U-boat Commander With an Introduction and Explanatory Notes by Etienne 2011-01-30T03:00:19.213Z The SI system comprises seven units of measure, some of which may not be so familiar: the metre, kilogram, second, ampere, candela, kelvin, and mole. Weight loss 2011-01-26T00:17:42Z The average voltage of a dry cell when new is one and one-half volts, while the amperage ranges from about twenty-five to fifty amperes according to size.7. 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 Then the electrician speaks lightly of numbers of "amperes," he may even talk of the number of "watts" used by the lamps, while occasionally the word "ohm" will leak out. 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 such a furnace a continuous current, for example, of 3000 amperes, at 50 to 60 volts, may be used at first, increasing to 5000 amperes in about half an hour. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Thus, in the absolute determination of the ampere with a current balance, the force between two coils carrying current is balanced by the earth’s gravitational force upon a body of determinable mass. Development of Gravity Pendulums in the 19th Century Contributions from the Museum of History and Technology, Papers 34-44 On Science and Technology, Smithsonian Institution, 1966 2011-01-22T03:00:16.753Z An ampere-meter or ammeter is an instrument by which the strength of an electric current is given in amperes. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli For instance, four cells of twenty-five amperes each would give a total of one hundred amperes when connected in parallel.67 A series multiple connection, fig. 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 units—the volt, ampere and ohm—are so related that a pressure of one volt acting upon a circuit with a resistance of one ohm will produce a current of one ampere. 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 If we reckon the current in amperes A, then I = A/10. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The current available at the cable ends for receiving is very small, being only 1/200000th part of an ampere, and this necessitates the use of apparatus of a very sensitive character. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 Almost invariably an ammeter gives its full-scale reading when a small current, say of the order of one-tenth of an ampere, is passing through the instrument itself. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli Supposing the current to be divided into 7 parts, 4 of these parts would flow in the first conductor 2 in the second and 1 in the third.82 The whole current is 42 amperes. 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 louder the voice into the transmitter the more current—measured in fractions of amperes—passed through the spiral. Whispering Wires Weber in inventing the electrodynamometer, and later Lord Kelvin devised ampere balances for the measurement of electric currents based on the attraction between coils conveying electric currents. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Light from a 25 ampere arc lamp for 2 to 5 minutes, at a distance of 18 inches, will generally suffice to "print" the impression on the metal sheets. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 Such a cell has a normal capacity of 560 ampere hours. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. A volt-coulomb of work is performed when one ampere of current flows for one second in a circuit whose resistance is one ohm, when the pressure is one volt. 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 the following table giving her results for uranium minerals the numbers under i give the maximum current in amperes. A Brief Account of Radio-activity The mean result of the best determinations shows that when a current of one ampere is passed for one second, a mass of silver is deposited equal to 0.001118 gramme. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z The current from a Wilde’s dynamo was passed, apparently with a current density of 5 or 6 amperes per sq. ft., until the anodes were too crippled for further use. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" The ampere-hour capacity of these batteries varies from 6 ampere hours to 4,000 ampere hours, respectively, when used at an average 8-hour discharge rate. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. The ampere is the unit rate of flow. 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 If the terminals, while the current is on, are drawn apart, a bright discharge, which may carry a current of many amperes, passes from one to the other. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 8 "Conduction, Electric" The ammeter usually shows that from 7 to 10 amperes pass through the criminal’s body. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z By means of a very brisk rotation of cathode, combined with a rapid current of electrolyte, J. W. Swan has succeeded in depositing excellent copper at current-densities exceeding 1000 amperes per sq. ft. Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 3 "Convention" to "Copyright" Just as we use years as the units in which to count up time so we use amperes as the units in which to count up streams of electrons. Letters of a Radio-Engineer to His Son It all depends on the rate of flow or the current strength in amperes. 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 When we see the street cars moving along our streets, it does not explain to say that the motor is driven by electricity of so many amperes at so many volts. The Rosicrucian Mysteries An Elementary Exposition of Their Secret Teachings Can the zinc shaving stand as many amperes as the fuse wire you ordinarily use? Common Science The four battery Tungar will charge from one to four 6 volt batteries at 5 amperes or less. The Automobile Storage Battery Its Care And Repair Don’t try to remember this number but do remember that an ampere is a unit in which we measure currents just as a year is a unit in which we measure time. Letters of a Radio-Engineer to His Son It is the power due to a current of one ampere flowing at a pressure of one volt. 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 Currents as small as .000000000000000000000000001 ampere have been detected and measured. Astounding Stories of Super-Science, March 1930 When are the greater number of amperes of electricity flowing through the zinc shaving? Common Science The capacity of a storage battery is therefore measured by the number of ampere hours it can furnish before its voltage drops below 1.7 per cell. The Automobile Storage Battery Its Care And Repair Then if we could increase the current until there were two amperes flowing through the meter we could mark that position of the pointer “2” and so on. Letters of a Radio-Engineer to His Son The product of the current passing through the coil multiplied by the number of turns composing the coil is called the ampere turns. 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 Central Processor and memory together require thirty amperes of 110 volts single phase 60 cycle ac. Preliminary Specifications: Programmed Data Processor Model Three (PDP-3) October, 1960 It will say 6A if it allows 6 amperes to pass through it; 25A if it allows 25 amperes to pass through it, etc. Common Science With a charging rate of 10 amperes, each charging line will require 10 times 40, or 400 watts. The Automobile Storage Battery Its Care And Repair To tell when an ampere of current is flowing requires the use of two silver plates and a solution of silver nitrate. Letters of a Radio-Engineer to His Son The current generally consumed is about 10 amperes, and it is necessary that it should remain at this strength to keep the lights burning steadily. 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 Each inactive tape transport requires two amperes and the one active transport requires 10 amperes. Preliminary Specifications: Programmed Data Processor Model Three (PDP-3) October, 1960 The fuse wire across the fuse gap allows about 8 amperes to pass through before it melts. Common Science With 10 amperes charging current per line, the capacity of the generator required will be equal to 400 watts multiplied by the number of charging lines. The Automobile Storage Battery Its Care And Repair The law says that if silver is being deposited at the rate of 0.001118 gram each second then the current is one ampere. Letters of a Radio-Engineer to His Son The lightning switch Mr. Brill had among his electric fixtures—merely a porcelain base, thirty ampere, single pole double throw battery switch. The Campfire Girls of Roselawn Or, a Strange Message from the Air The mil-ammeter is so adjusted as to give a maximum current of 1.5 amperes and the voltmeter reads from zero to 150 volts. Respiration Calorimeters for Studying the Respiratory Exchange and Energy Transformations of Man There are amperes, and there are volts, and there are kilowatt hours. David and the Phoenix This Tungar will charge a 6 volt battery at two amperes, a 12 volt battery at one ampere and eight cells at 0.75 ampere. The Automobile Storage Battery Its Care And Repair You remember that an ampere means an electron stream at the rate of about six billion billion electrons a second. Letters of a Radio-Engineer to His Son As an ordinary practical result, these lamps, working with 50 volts and 1.15 amperes, give a luminous intensity of 20 candles, or the equivalent in luminous spherical intensity of 1.1 Edison A lamps. Scientific American Supplement, No. 488, May 9, 1885 Not more than 6 amperes should be used on any single branch circuit. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine To fuse a tin wire one centimeter in diameter requires a fusing current of electricity of 405.5 amperes. Tin Foil and Its Combinations for Filling Teeth It will charge from one to ten 6 volt batteries, or the equivalent at six amperes or less. The Automobile Storage Battery Its Care And Repair When some one asks how large a current is flowing in a wire we don’t tell him six billion billion electrons each second; we tell him “one ampere.” Letters of a Radio-Engineer to His Son But when Dr. Powers got through I felt as if all the God he believed in was a kind of electrical force, a little bigger unit of amperes. The High Calling Your machine is built to stand a certain number of amperes, and this should not be exceeded in general practice. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Let's see—two carbons and about twenty amperes of current, against nine ships at ten millions apiece. The Wreck of the Titan or, Futility For example, one circuit may be regulated to three amperes while the other circuit is delivering six amperes. The Automobile Storage Battery Its Care And Repair If we could put this meter in an electric circuit 54where we knew one ampere was flowing we could put a numeral “1” opposite where the pointer stood. Letters of a Radio-Engineer to His Son They are of 8 amperes and 50 volts; that is to say, of 4 hectowatts, and are presumed to give an illuminating power of 300 carcels. Scientific American Supplement, No. 1082, September 26, 1896 Allowing 2 watts for each cubic foot, we would require 768 watts of current, or practically 7 amperes at 110 volts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine An ampere motor in series with the motor while running off the morning paper with only the cylinder press in operation stood at 12 amperes. Scientific American Supplement, No. 664, September 22,1888 For a six volt battery this should rarely exceed 14 amperes. The Automobile Storage Battery Its Care And Repair After we had done so we would call it an “ammeter” because it measures amperes. Letters of a Radio-Engineer to His Son They give a current of eight hundred amperes and twenty-five hundred volts for the forty-thousandth of a second. Long Ago, Far Away Batteries are rated first, as to voltage; second, as to their capacity in ampere hours—that is, the number of amperes that may be drawn from them in a given number of hours. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine To develop its rated power at 110 volts would require about 16 amperes in the motor. Scientific American Supplement, No. 664, September 22,1888 If we drew only five amperes from this battery, it should be able to furnish this current for eight hours. The Automobile Storage Battery Its Care And Repair Now I want to tell you how the physicists at the Bureau know what is an ampere. Letters of a Radio-Engineer to His Son Finally, with a drain of ten thousand amperes, all the equipment available could handle, the needle was steady as a rock, though the tremendous load of 800,000,000 watts was cut in and out. The Ultimate Weapon A battery of 120-ampere hour capacity should be charged for 8 or 9 hours at the rate of 120 ÷ 8, or 15 amperes, etc. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A 2 horse motor of 82 per cent. efficiency with 9 amperes of current will require about 200 volts to develop 2 actual H. P. Scientific American Supplement, No. 664, September 22,1888 Theoretically, a battery has a capacity of 40 ampere hours if it furnishes ten amperes for four hours, and if it is unable, at the end of that time, to furnish any more current. The Automobile Storage Battery Its Care And Repair They decided just what they would call an ampere and then all the countries from which they came passed laws saying that an ampere 55should be what these scientists had recommended. Letters of a Radio-Engineer to His Son Volts times amperes equal watts, as far as he's concerned, and the term 'power factor' does nothing but confuse him. Anchorite It should register in amperes, one-eighth of the ampere-hour capacity of the battery, as already explained. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Mr. Swan claims to be able to get a hard deposit of copper with a current density of 1000 amperes per square foot, but seems to recommend about one-tenth of that amount for general use. On Laboratory Arts That is, the current in amperes, multiplied by the number of hours the battery, furnished this current should be constant. The Automobile Storage Battery Its Care And Repair The volt is defined by law and is based on the suggestions of the same body of scientists who recommended the ampere of our last letter. Letters of a Radio-Engineer to His Son The ampere current delivered by a dynamo under certain conditions. Electricity for Boys By connecting 15 such lamps across the mains, in parallel, the required 7½ amperes of current would be flowing from the generator through the lamps, and back again. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine For general purposes a current density of say ten to fifteen amperes per square foot may be used, but this may be considerably varied, so long as the upper limit is not greatly overpassed. On Laboratory Arts As mentioned above, the ampere hour rating of a battery is based upon a continuous discharge, starting with a specific gravity of 1.280-1.300, and finishing with 1.150. The Automobile Storage Battery Its Care And Repair Suppose the ammeter shows a current of one ampere and the voltmeter an e. m. f. of one volt. Letters of a Radio-Engineer to His Son It is the quantity passed by a current of one ampere intensity in one second of time. Electricity for Boys To charge this battery would require a dynamo capable of delivering 10 amperes of current for 9 hours. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A current density of, at most, fifteen amperes per square foot may be used, either for obtaining solid deposits for constructional purposes or for calibrating current measuring instruments by electrolysis. On Laboratory Arts With a discharge rate of 75 amperes, it required 34 minutes. The Automobile Storage Battery Its Care And Repair How many ohms would the coil have if it took 5 volts to send 2 amperes through it. Letters of a Radio-Engineer to His Son While the large part of the wire would carry 500 amperes, the small wire could not possibly carry more than, say, 10 amperes. Electricity for Boys Three amperes would require a wire of at least 1,500 circular mills in area for safety. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The solution is preferably heated to a temperature of about 50° C., and a strong current is sent through it, say twenty amperes to the square foot of anode. On Laboratory Arts With a discharge rate of 25 amperes, it required 160 minutes. The Automobile Storage Battery Its Care And Repair If a coil of resistance three ohms is carrying two amperes what is the voltage across the terminals of the coil? Letters of a Radio-Engineer to His Son An ampere is an electromotive force of one volt through a resistance of one ohm. Electricity for Boys A resistance permitting 40 amperes of current to flow, would be necessary. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine By a weak current I mean one of about five amperes per square foot. On Laboratory Arts For average driving conditions, the maximum charging current should not exceed 12 to 14 amperes for a 6 volt, 11 to 13 plate battery, and 6 to 7 amperes for a 12 volt battery. The Automobile Storage Battery Its Care And Repair For 1 ohm it would take 1 volt to give a current of 1 ampere, wouldn’t it? Letters of a Radio-Engineer to His Son The quantity of electricity in a secondary battery when fully charged, usually reckoned in ampere p. 192hours. Electricity for Boys Thus, this battery should be charged at the rate of 7½ amperes for 8 hours, with another hour added to make up for losses that are bound to occur. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine It is the electro-motive force of one volt and the current intensity of one ampere. p. Practical Mechanics for Boys A one-gallon stone or earthenware jar will hold the negative plates of a 100 ampere hour battery if you nest two of the groups. The Automobile Storage Battery Its Care And Repair For 3 ohms it takes three times as much to give one ampere. Letters of a Radio-Engineer to His Son If, for instance, you want the cell to have a charge of 2 amperes, four of these lamps should be connected up in parallel. Electricity for Boys In some instances, it will be necessary to install a battery of 120 or more ampere hours, whereas a battery of 40 or 60 ampere hours would be quite serviceable in other instances. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Suppose the maximum current this will carry is ¼ ampere per square inch, which will give a cross section of the solution of at least 60 ÷ ¼ = 240 square inches. Scientific American Supplement, No. 1157, March 5, 1898 The ampere hour capacity is computed for the 8 hour rate, that is, the current is drawn from the battery continuously for 8 hours, and at the end of that time the battery is discharged. The Automobile Storage Battery Its Care And Repair 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 If 3 amperes are required, use 6 lamps, and so on. p. Electricity for Boys The generator is a 5 kilowatt machine, capable of producing 45 amperes at 110 volts pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine This was taken merely as an illustration, because its specific resistance was known when the current density was ¼ ampere per square inch. Scientific American Supplement, No. 1157, March 5, 1898 Rated in this way, a battery of 16 cells rated at 80 ampere hours at the 8 hour rate would be rated at 112 ampere hours, or 3584 watt hours. The Automobile Storage Battery Its Care And Repair We can find the power expended in the plate circuit of a tube by multiplying the number of volts in its battery by the number of amperes which flows. Letters of a Radio-Engineer to His Son In order to utilize a current for this purpose, a high ampere flow and low voltage are required. Electricity for Boys If his switchboard voltage was set at say 120, the voltage at his house, at 26 amperes of load, would fall to 94 volts, which would cause his lights to dim considerably. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine With the water carrying 2 amperes the watts absorbed would be over 10 per cubic inch, while for the saturated solution of salt when carrying 11 amperes it would be only about 0.4 watt. Scientific American Supplement, No. 1157, March 5, 1898 The product resulting from multiplication of amperes flowing by time of flow in hours, e.g., a battery supplying 10 amperes for 8 hours gives 80 ampere hours. The Automobile Storage Battery Its Care And Repair The same electron stream passes through all parts of this circuit and the ammeter tells us what this stream is in amperes. Letters of a Radio-Engineer to His Son Calculating the Voltage.—In order to arrive at the voltage we must use a conductor, which, with a resistance of 1 ohm, will produce 1 ampere. Electricity for Boys If the capacity of the machine is under 30 amperes, plug fuses, costing 3 cents each, can be used. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine It would not carry 4 amperes for over fifteen or twenty minutes, although the jar was full of water and the plates only ¾ inch apart. Scientific American Supplement, No. 1157, March 5, 1898 The current in amperes at which a battery may be charged for twenty-four hours or more. The Automobile Storage Battery Its Care And Repair It also means one ohm is such a resistance that one volt will send through it a current of one ampere. Letters of a Radio-Engineer to His Son Thus, if we have 5 amperes and 110 volts, the result of multiplying them would be 550 watts, or 5 volts and 110 amperes would produce 550 watts. Electricity for Boys The dynamo required for the above plant delivers 10 amperes at 45 volts pressure, or 10 × 45 = 450 watts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A run was made with 1 ampere and then with 2 amperes for one hour. Scientific American Supplement, No. 1157, March 5, 1898 It is necessary to state the rate of flow, since same battery if discharged at 20 amperes would not last for 4 hours but for a shorter period, say 3 hours. The Automobile Storage Battery Its Care And Repair For example, it means also 66that one volt will send a current of one ampere through a resistance of one ohm. Letters of a Radio-Engineer to His Son In practice the word "current" is used to designate ampere flow; and electromotive force, or E. M. F., is used instead of voltage. Electricity for Boys It would consume 6 × ½ ampere, or 3 amperes of current, and interpose a resistance of 36.6 ohms—say 37 ohms. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine These values are too low to be considered maximum values, for this cross section of a 10 per cent. salt solution would probably carry 13 to 15 amperes safely. Scientific American Supplement, No. 1157, March 5, 1898 It is expressed in amperes and varies for different sized cells. The Automobile Storage Battery Its Care And Repair Therefore we say that a coil has one henry of inductance when an electron stream 85which is increasing one ampere’s worth each second stirs up in the coil a conscientious objection of one volt. Letters of a Radio-Engineer to His Son The current is measured in amperes, and the force with which it is caused to flow is measured in volts. Electricity for Boys Forty-two feet of No. 20 German silver wire would emit this amount of heat and limit the current output to 7 amperes. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine They even managed to get six hundred amperes through a piece of lead wire no bigger than a pencil lead. Islands of Space Two or three amperes per positive plate in each cell will generally be satisfactory. The Automobile Storage Battery Its Care And Repair If a current of one millionth of an ampere should flow for just one second six million million electrons would pass along by every point in the path or circuit. Letters of a Radio-Engineer to His Son Suppose I hadn't been working with a storage cell that gave only four amperes at two volts? The Skylark of Space Allowing 500 circular mills for each ampere, the gauge of the wire should be 40 × 500 = 20,000 circular mills, or approximately No. 7 B. & S. gauge. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A relay snapped, and instantly the ammeter jumped to read 4500 amperes. Islands of Space A battery having eleven plates in each cell should, for example, be charged at about 11 to 12 amperes. The Automobile Storage Battery Its Care And Repair A pointer attached to the coil indicates how far; and the number of volts or amperes is read off from the calibrated scale. Letters of a Radio-Engineer to His Son A beam behind which was every volt and ampere that the gigantic generators and accumulators of the planetoid could yield. Triplanetary When resistance on the external circuit is lowered, by means of turning on lamps or other devices, the current from the armature increases in working power, by increasing its amperes. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine "I don't have a direct reading on this," he explained, "but an indirect reading from the magnetic field in that room shows a current of nearly a hundred million amperes!" Islands of Space Its capacity is 80 ampere hours at the 8 hours rate of current flow. The Automobile Storage Battery Its Care And Repair Instruments for measuring alternating e. m. f.’s and currents, read in volts and in amperes. Letters of a Radio-Engineer to His Son Arcot pushed the control over to the last ampere, and felt the slight surge, as greater power rushed through the coils momentarily. The Black Star Passes This is usually done by indicating its capacity in watts, which as we have seen, means volts times amperes, and from this one can figure ohms, by the above formulas. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine According to your magnetic drag meter, the conductors were carrying over fifty billion amperes. Islands of Space Place the battery on charge at the ampere rate given in the following table. The Automobile Storage Battery Its Care And Repair Of course part of the time of each cycle the stream is larger than an ampere but for part it is less. Letters of a Radio-Engineer to His Son A current may have 2 amperes and 40 volts, or 40 amperes and 2 volts. The Wonder Island Boys: Exploring the Island Our dynamo as we discover by reading its plate, is rated to deliver 50 amperes, let us say, at 110 volts pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine "Forty-five hundred amperes at twenty thousand volts," the elder Arcot said softly. Islands of Space Voltage readings taken on open circuit are of no value, so while taking these readings the battery should be on discharge, having at least a discharge of 15 amperes. The Automobile Storage Battery Its Care And Repair If the average heating effect is the same the a-c is said to be one ampere. Letters of a Radio-Engineer to His Son The thought carried him back to the electrical laboratory of the Institute, and he began to dream that he was still a student of ohms, volts, and amperes. Under the Great Bear If he drew 26 amperes, the voltage would fall, at the house, 26 volts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A current of 10-9 ampere produces a deflection of 1 mm. at a distance of 1 metre. Response in the Living and Non-Living A specified current in amperes at which a discharged battery may be charged at the beginning of a charge. The Automobile Storage Battery Its Care And Repair But it is a little different when one is interested in an ampere. Letters of a Radio-Engineer to His Son An 8-foot propeller of butternut wood is the prime mover for wind power generator which in a brisk wind generated 110 volts and 10 amperes at 300 RPM. Growing Nuts in the North A Personal Story of the Author's Experience of 33 Years with Nut Culture in Minnesota and Wisconsin Five amperes at 1,100 volts pressure, gives the same number of watts, power, as 50 amperes, at 110 volts pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine In order to produce the difference of phase, a resistance of 17 ohms was introduced into the second circuit, when the dynamo produced a current of 9 amperes with 80 inversions per second. Scientific American Supplement, No. 717, September 28, 1889 The commercial unit of electrical power, and is the product of voltage of circuit by amperes flowing. The Automobile Storage Battery Its Care And Repair You can’t make an ampere out of a piece of platinum as you can a standard pound weight. Letters of a Radio-Engineer to His Son Gradually the size was increased, until at the present time mirrors as large as seven feet in diameter and electric currents as great as several hundred amperes are employed. Artificial Light Its Influence upon Civilization If, however, the pressure were 110 volts, and the current one ampere, and the resistance one ohm, the effective pressure after transmission would be 110-1, or 109 volts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine A storage battery capable of furnishing 3,000 amperes for one hour is used in co-operation with the dynamos provided to excite the alternators. The New York Subway Its Construction and Equipment One ampere flowing under pressure of one volt represents one watt of power. The Automobile Storage Battery Its Care And Repair An ampere is a stream of electrons at about the rate of six billion billion a second. Letters of a Radio-Engineer to His Son The armature is 17 in. in length and the same in diameter, measured over the winding, and develops at the machine terminals 70 volts and 200 amperes at 480 revolutions. Scientific American Supplement, No. 711, August 17, 1889 To force a 110-volt current of 50 amperes through the resistance of one ohm, would require the expenditure of 50 volts pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The battery is charged with 10 liters of solution, and is capable of furnishing for 5 hours a current of 7 amperes with a difference of potential of 9 volts at the pile terminals. Scientific American Supplement, No. 443, June 28, 1884 It is preferable to charge the battery at the ampere rate given above, but if this cannot be done, the temperature must be carefully watched so that it does not exceed 110° F. The Automobile Storage Battery Its Care And Repair No one could ever count anywhere near that many, and yet everybody who is concerned with electricity wants to be able to measure currents in amperes. Letters of a Radio-Engineer to His Son The unit of electric power is called the watt; it is the power furnished by a current of one ampere with a voltage of one volt. General Science Therefore it would be necessary to carry only 5 amperes, at this rate. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Upon immersing the electrodes in new liquid, and with no resistance in the external circuit, the current may reach 100 amperes. Scientific American Supplement, No. 443, June 28, 1884 If there is a constant load of 10 amperes or more, the plant should be started up when the heavy load comes on. The Automobile Storage Battery Its Care And Repair To measure it we find the quotient of the number of volts applied to the circuit by the number of amperes which flow. Letters of a Radio-Engineer to His Son The meters commonly used measure the amperes, volts, and time automatically, and register the electric power supplied in watt hours. General Science An ampere of electricity is the unit of the rate of flow and may be likened to a gallon of water per minute. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine On renewing the liquids during the operation of the pile, a current of 7 amperes is kept up if about a liter of saturation per hour be allowed to pass into the battery. Scientific American Supplement, No. 443, June 28, 1884 Occasionally the plant and battery are used to carry continuous loads of from 10 to 15 amperes each night, with practically no day load. The Automobile Storage Battery Its Care And Repair Each time we move the slider we get a new pair of values for volts and amperes. Letters of a Radio-Engineer to His Son A current is said to be one ampere strong if it will deposit silver on an electrode at the rate of 0.001118 gram per second. General Science Showing the analogy of water to volts and amperes of electricity The same is true in figuring the power of electricity. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine In many of our experiments we have succeeded in obtaining an acid so anhydrous that a current of 25 amperes was entirely arrested. Scientific American Supplement, No. 561, October 2, 1886 The charging current generally has a maximum value of 6 amperes. The Automobile Storage Battery Its Care And Repair As a matter of fact we don’t get amperes or even mil-amperes; we get millionths of an ampere or “microamperes,” as we say. Letters of a Radio-Engineer to His Son The current remained constant at 28 amperes until 5 P.M., and it only dropped to 25 amperes at the completion of the double voyage between England and France. Scientific American Supplement, No. 620, November 19,1887 We multiply the amperes by the number of electric impulses that are created in the wire in the course of one second. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The current through the fuse being more than 7 amperes, it will blow promptly, opening the line and isolating the apparatus. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. If the ammeter shows a charging current of three amperes or more as soon as it closes, the cutout is at fault. The Automobile Storage Battery Its Care And Repair Let E be the potential of the conductor from which the current is drawn, measured in volts, C the current in amperes, and E1 the E.M.F. of the dynamo. Scientific American Supplement, No. 388, June 9, 1883 The life of the cells must be expressed upon the principle of ampere hours or the amount of energy given off by them. Scientific American Supplement, No. 620, November 19,1887 Thus an electric current under a pressure of 100 volts, and a density of 7.46 amperes, is one horsepower; as is 74.6 amperes, at 10 volts pressure; or 746 amperes at one volt pressure. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine It is not expected that this arrester will blow because 6 or 7 amperes of abnormal currents are flowing through it and the apparatus to be protected. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The two ampere Tungar is normally made for operation on a sixty cycle circuit, at 115 volts. The Automobile Storage Battery Its Care And Repair Hence the total leakage cannot exceed 2.5 amperes, representing a loss of three-fourths of a horse power, or under 5 per cent, when four cars are running. Scientific American Supplement, No. 388, June 9, 1883 It is well known that we can discharge the storage battery ad libitum at the rate of 2 amperes or 200 amperes. Scientific American Supplement, No. 620, November 19,1887 It would take two volts to force two amperes through one ohm; or 100 volts to force 100 amperes through the resistance of one ohm. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine These fuses have ordinarily a carrying capacity of 6 or 7 amperes. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. With a constant potential charging set, as shown in Figure 48, the charge may start at as high a rate as 50 amperes. The Automobile Storage Battery Its Care And Repair A record was made of the volts and amperes used, and from this the power expended was deduced, the motor having been previously carefully calibrated by means of a brake. Scientific American Supplement, No. 841, February 13, 1892 The current required to run a street car is about thirty amperes, and an electromotive force of about 180 volts. Scientific American Supplement, No. 620, November 19,1887 He would lose 11 volts pressure drawing 26 amperes; and he would lose 18 volts pressure drawing 45 amperes, if by any chance he wished to use full load. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The inductance of a circuit is one henry when a change of one ampere per second produces an electromotive force of one volt. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. If additional bulbs are used to obtain louder sounds, each such bulb also draws one ampere from the storage battery. The Automobile Storage Battery Its Care And Repair The dynamo is designed to feed sixty lamps of 16 candle power each, the current being 60 amperes at 50 volts. Scientific American Supplement, No. 841, February 13, 1892 To draw one car it will take an average of 20 amperes, and the only loss will be 20 multiplied by 20, that is, 400 watts through line resistance. Scientific American Supplement, No. 620, November 19,1887 A stove or range drawing 40 amperes, would require a No. 4 wire, in moulding. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine The units are: of current, the ampere; of electromotive force, the volt; of resistance, the ohm. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The standard audion-bulb receiving set does not use more than three bulbs, and hence the maximum current drawn from the battery does not exceed three amperes. The Automobile Storage Battery Its Care And Repair The electric lighting machinery consists of three dynamos of Siemens manufacture driven by a Willans engine, each of which is capable of producing a current of 400 amperes. Scientific American Supplement, No. 832, December 12, 1891 We can charge such larger cells with 50 or 60 amperes instead of thirty. Scientific American Supplement, No. 620, November 19,1887 Each time the resistance is lowered, therefore, the current passing through the field magnets becomes more dense in amperes, and makes the field magnets correspondingly stronger. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine Thus, when the current strength is measured in amperes, this magnetizing force is expressed as ampere-turns, being the product of the number of amperes flowing by the number of turns. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The 6EA battery, made in capacities of 60, 80, and 100 ampere hours. The Automobile Storage Battery Its Care And Repair An ampere meter and a commutator are introduced between the battery and the electrolysis apparatus; the former affording an excellent indication of the progress of the electrolysis. Scientific American Supplement, No. 832, December 12, 1891 We called it an ampere register, but no doubt we would give it a better name to-day. Scientific American Supplement, No. 620, November 19,1887 Say he wishes to transmit 26 amperes with a loss of 10 volts. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine At best, therefore, it is only capable of producing about 1 ampere. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. Under these conditions, the generator should supply the current for the lights, and still send a charging current of 3 to 5 amperes through the battery. The Automobile Storage Battery Its Care And Repair Weak currents of electricity, 0.03 to 0.04 ampere, have been passed through sirups for fourteen hours without any special increase in purity coefficient. Scientific American Supplement, No. 832, December 12, 1891 Seventy of these cells will propel an ordinary street car for four hours and a half, while consuming the stored energy at the rate of 30 amperes, or over 5.6 electrical horse power. Scientific American Supplement, No. 620, November 19,1887 It is true that, in this case, the current would be in the neighborhood of 15,000 amperes. Scientific American Supplement No. 819, September 12, 1891 Another conception of this quantity may be had by remembering that a coulomb is such a quantity of current as will result from one ampere flowing one second. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. If the cutout closes late, and only about an ampere of charging current is indicated on the ammeter, and the cutout points are fairly clean and smooth, the trouble is generally in the generator. The Automobile Storage Battery Its Care And Repair The current from the dynamos is led by copper bars to an enormous "cut out," calculated to fuse at 8,000 amperes. Scientific American Supplement No. 822, October 3, 1891 With a power of 25 kilogrammeters it furnishes a current of 40 volts and 7 amperes, which is more than sufficient to run two 50-candle incandescent lamps. Scientific American Supplement, No. 483, April 4, 1885 When all the cells are in series, the resistance of the battery will be 96 ohms, the total resistance of the circuit 102 ohms, and the full value of the current 0.235 ampere. Scientific American Supplement, No. 787, January 31, 1891 A good cell of the two and three-quarters by six-inch size will give eighteen or twenty amperes on short-circuit, when new. Cyclopedia of Telephony & Telegraphy Vol. 1 A General Reference Work on Telephony, etc. etc. The amperes indicated on the ammeter should be the greatest when the main headlamps are burning bright. The Automobile Storage Battery Its Care And Repair To find the current in amperes, this weight, expressed in grammes, must be divided by the number of seconds during which the current has been passed, and by 0.001118. Scientific American Supplement No. 822, October 3, 1891 As a source of electricity, use is made of a bichromate of potash battery of 6 elements, capable of giving 10 volts and 15 amperes. Scientific American Supplement, No. 483, April 4, 1885 Clearly, then, such a magnet must have a very large magnetizing power, with many ampere turns upon it, to be able to make the required number of magnetic lines pass across the air resistance. Scientific American Supplement, No. 787, January 31, 1891 When transformers are used, the field magnets are weak, while the condenser current rises to 40 amperes. Scientific American Supplement, No. 795, March 28, 1891 This condition is shown by a discharge current of about 5 amperes when the engine has stopped. The Automobile Storage Battery Its Care And Repair It should be mentioned that the car was lighted at night by two incandescent lamps, which absorbed 1.5 amperes each; and the brakes also were worked by the accumulators. Scientific American Supplement, No. 530, February 27, 1886 They tramped and rode back and forth along the right of way, occupied with their insulations, the height of their water, their watts and volts and amperes. The Rules of the Game Experiments show that a current of one ampere passing for one second, i.e., a coulomb of electricity, causes the deposition of 0.001118 gram of silver from a normal solution of a silver salt. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The dimensions of the instrument are such that when the deflection is 45 deg. the current flowing through the coils upon the ring is 1/2 ampere. The Boy Mechanic: Volume 1 700 Things for Boys to Do This is an important feature, as one line may be used in starting a charge at 10 amperes, and the other for charging the batteries, that have begun to gas, at a reduced rate. The Automobile Storage Battery Its Care And Repair It is a little electro-magnetic cut-out that breaks the telephone circuit whenever a current passes into the circuit equal to or more than an ampere. Scientific American Supplement, No. 481, March 21, 1885 In his experiments in September, 1885, Dr. D'Arsonval obtained with an accumulator of 2 square meters of surface: Useful capacity 40 ampere hours. Scientific American Supplement, No. 598, June 18, 1887 With such an apparatus the amperage may be increased to 5 or even 10 amperes and depositions completed with great rapidity and accuracy. An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes The ampere is the unit chosen to designate the strength of the electric current. The Boy Mechanic: Volume 1 700 Things for Boys to Do Therefore, when this gassing begins, the charging rate should be reduced, unless the entire charging has been done at a low rate, say about five amperes. The Automobile Storage Battery Its Care And Repair At once the hand fell to zero, indicating that there was not an ampere of current left. Tom Swift and His Electric Runabout, or, the Speediest Car on the Road This apparatus, if charged to saturation, gives 62 ampere hours as its total capacity, and, as in the Plante, this capacity constantly increases with use. Scientific American Supplement, No. 598, June 18, 1887 The next point was to secure a joint between contiguous rails such as would permit of the passage of several thousand amperes without introducing undue resistance. Edison, His Life and Inventions The capacity of this rectifier is from 3 to 5 amperes, which is sufficient for charging small storage batteries, running small motors and lighting small lamps. The Boy Mechanic: Volume 1 700 Things for Boys to Do An example of a 100 ampere test on a good rebuilt cell with eleven plates is as follows: Voltage immediately after start of discharge, 1.88. The Automobile Storage Battery Its Care And Repair "I forgot to ring the bell," apologized Tom, as he sent out a peal from the gong, and then, he let out a few more amperes, and the speed increased. Tom Swift and His Electric Runabout, or, the Speediest Car on the Road According to the inventor's experiments, the square meter of active surface can receive a charging current of 10 amperes, and furnish on discharging a current of the intensity of 20 amperes. Scientific American Supplement, No. 598, June 18, 1887 It was several months before he could convey one hundred amperes by means of such contacts, but he worked out at last a satisfactory device which was equal to the task. Edison, His Life and Inventions The brass frame is wound with magnet wire, the size depending on the number of amperes to be measured. The Boy Mechanic: Volume 1 700 Things for Boys to Do The normal charging rate is six amperes, but a current of as high as seven amperes may be obtained without greatly reducing the life of the bulb. The Automobile Storage Battery Its Care And Repair The capacity ranges from 20 to 100 ampere-hours, and the current for a single cylinder engine will average one to one and a half amperes during the running intervals. The Project Gutenberg Encyclopedia Volume 1 of 28 To give 1 square meter a capacity of 20 ampere hours, there is required only a quarter of an hour's treatment. Scientific American Supplement, No. 598, June 18, 1887 They were not large—about twelve horse-power each—generating seventy-five amperes of current at one hundred and ten volts, so that not quite twenty-five horse-power of electrical energy was available for propulsion. Edison, His Life and Inventions The resistance is now adjusted to show .5 ampere on the standard ammeter and the position of the pointer marked on the scale. The Boy Mechanic: Volume 1 700 Things for Boys to Do If these are blown or are defective, replace them with 15 ampere fuses, Cat. The Automobile Storage Battery Its Care And Repair Table I. shows roughly the weight of given types of cells for a given output in ampere hours. The Project Gutenberg Encyclopedia Volume 1 of 28 For a "No. 10" accumulator we have an active surface of 10 square meters, a charging current of 100 amperes, and on discharging a current of 200 amperes. Scientific American Supplement, No. 598, June 18, 1887 Some care is necessary in the management of the current, which should have a density of about 17 amperes per square foot of surface--not much above or below. Scientific American Supplement, No. 497, July 11, 1885 By keeping in mind the ampere output of the battery and rating of the lamp, one can regulate the batteries as required. The Boy Mechanic: Volume 1 700 Things for Boys to Do If a lamp bank is used, a switchboard type meter reading to about 25 amperes is suitable. The Automobile Storage Battery Its Care And Repair When the P.D. had fallen to 1.6 volt the cell was automatically switched into a charging circuit, and with a current of 9 amperes yielded the curve in fig. The Project Gutenberg Encyclopedia Volume 1 of 28 The normal rule for the charge is 10 amperes per square meter, and for the discharge double this quantity. Scientific American Supplement, No. 598, June 18, 1887 This means, therefore, that when the electromotive force or potential is great enough to send a current of 1/33 ampere through the body, fatal results will ensue. Scientific American Supplement, No. 433, April 19, 1884 This is more economical than dry cells, as it gives about 4 volts and 3 amperes. The Boy Mechanic: Volume 1 700 Things for Boys to Do With the usual series method of charging, a charge may, in an emergency, be started at 20 amperes or more. The Automobile Storage Battery Its Care And Repair The current to be measured flowed through both coils in parallel circuit, the one representing its quantity expressible in amperes, and the other its potential expressible in volts. Scientific American Supplement, No. 384, May 12, 1883 The charge is effected in two hours up to 20 amperes, without any appreciable loss of electricity. Scientific American Supplement, No. 598, June 18, 1887 Taking for example a well known system of arc lighting, we find that the lamps require individually an electromotive force of 40 volts with a current of 10 amperes. Scientific American Supplement, No. 433, April 19, 1884 Continue in this way with 2 amperes, 3 amperes, 4 amperes, etc., until the scale is full. The Boy Mechanic: Volume 1 700 Things for Boys to Do As a general rule do not use a higher rate than 10 amperes. The Automobile Storage Battery Its Care And Repair At the Champs Elysées concerts the lamps burn crayons of 9 to 10 millimeters with a current of 9 to 10 amperes and an effective electro-motive power of 60 volts per lamp. Scientific American Supplement, No. 362, December 9, 1882 We could employ half the number of cells by using them at the rate of 80 amperes, but then they will supply the power for less than half the time. Scientific American Supplement, No. 430, March 29, 1884 The well known ammeters and voltmeters of the authors used for electric light work are now constructed so as to dispense with a constant, and give the readings in amperes and volts without calculation. Scientific American Supplement, No. 433, April 19, 1884 To calibrate the instrument, first mark the binding-post A, which is connected to the coil of heavy wire, for amperes and the other post, V, to the coil of small wire for volts. The Boy Mechanic: Volume 1 700 Things for Boys to Do A charging rate of 6 amperes is suitable for all but the very smallest batteries. The Automobile Storage Battery Its Care And Repair These strands are usually No. 30 gauge wire and will fuse at about 10 amperes. 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 I have now to draw your attention to a new motor of my own invention, of the weight of 124 lb., which, at 1,550 revolutions, gives 31 amperes and 61.5 volts at terminals. Scientific American Supplement, No. 430, March 29, 1884 The current required for heating the filament is about 1 ampere at 6 volts. The Radio Amateur's Hand Book These cells having been "run out" beyond the required number of amperes for automobile use, will give excellent service, considering their cost. The Boy Mechanic: Volume 1 700 Things for Boys to Do A five ampere rate is even better, but more time will be required for the charge. The Automobile Storage Battery Its Care And Repair Current at 2c per kilowatt hour, metallic electrode arc of 150 amperes, carbon arc 500 amperes; voltage across the metallic electrode arc 20, voltage across the carbon arc 35. 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 We let him attend to a six horse power steam engine, boiler, and dynamo machine for charging 50 accumulators, each of a capacity of 370 ampere hours, or one horse power hour. Scientific American Supplement, No. 430, March 29, 1884 JOULE.—The energy spent in 1 second by a flow of 1 ampere in 1 ohm. The Radio Amateur's Hand Book Sixteen amperes," he remarked to himself, "I don't attempt to use the batteries when they fall below five. Guy Garrick Add the total amperes on all the panels and see that it does not exceed the ampere reading on the nameplate.Wrong setting of the brush rocker arm. The Automobile Storage Battery Its Care And Repair Volts correspond to water pressure measured by pounds to the square inch; amperes represent the flow in gallons per minute. 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 Usually, however, it is the weight of silver or copper deposited from their salts in a certain time which gives the current in amperes. The Story of Electricity AMMETER.—An instrument used for measuring the current strength, in terms of amperes, that flows in a circuit. The Radio Amateur's Hand Book The little group in the machine shop was soon deep in the discussion of ohms, amperes, volts and currents, and, for a time, Tom almost forgot the message calling him to Philadelphia. Tom Swift and His Wireless Message: or, the castaways of Earthquake island The two ampere Tungar is, of course, more suitable for the car owner than for a garage or service station. The Automobile Storage Battery Its Care And Repair The dynamo is started, and a current of high amperage and low voltage is generated, generally 100 to 125 amperes, and with sufficient pressure to decompose the electrolyte between the anode and the cathode. Getting Gold: a practical treatise for prospectors, miners and students To yield a good light such a lamp requires or "takes" about 1/2 an ampere. The Story of Electricity The controlling current flows through a separate circuit from that of the radio current and a fraction of an ampere will control several amperes in the aerial wire. The Radio Amateur's Hand Book "Bless my volts and amperes!" exclaimed Mr. Damon. Tom Swift and His Electric Locomotive, or, Two Miles a Minute on the Rails The One Battery Tungar Rectifier This Tungar will charge a 6 volt battery at five amperes, or a 12 volt battery at three amperes. The Automobile Storage Battery Its Care And Repair But I admired him, for he had every ampere of his self-possession in hand; my own case was different. The Return of Dr. Fu-Manchu Thus, if 1/2 of an ampere is flowing in the lamp, it is also flowing in the battery and wires. The Story of Electricity WATT.—The power spent by a current of 1 ampere in a resistance of 1 ohm. The Radio Amateur's Hand Book For batteries having a capacity of 80 ampere hours or more, use a current of 5 amperes. The Automobile Storage Battery Its Care And Repair For instance, five batteries could be charged at six amperes, five batteries at four amperes, and five batteries at ten amperes. The Automobile Storage Battery Its Care And Repair A hot-wire ammeter reading to 2.5 amperes will serve your needs, it costs $6.00 and is shown at E in Fig. The Radio Amateur's Hand Book In other meters the current passes through a species of galvanometer called an ampere meter, and controls a clockwork counter. The Story of Electricity HENRY.—The inductance in a circuit in which the electromotive force induced is 1 volt when the inducing current varies at the rate of 1 ampere per second. The Radio Amateur's Hand Book The volt is the electromotive force which produces a current of 1 ampere when steadily applied to a conductor the resistance of which is 1 ohm. The Radio Amateur's Hand Book When the ends of the prongs are pressed down on the terminals of a cell, a current of 150 to 200 amperes is drawn from the cell. The Automobile Storage Battery Its Care And Repair The coulomb is the quantity of electricity transferred by a current of 1 ampere in 1 second. The Radio Amateur's Hand Book The current is of 120 volts or the same as that used in an ordinary incandescent lighting circuit, but is alternating and of 4,000 amperes. The Story of Electricity MILLI-AMMETER.—An ammeter that measures a current by the one-thousandth of an ampere. The Radio Amateur's Hand Book To measure the current in amperes an instrument called an ammeter is used, as shown at A in Fig. The Radio Amateur's Hand Book Hence, its capacity at the 3 hour rate would be 3x2O=60 ampere hours. The Automobile Storage Battery Its Care And Repair To find the watts a current develops you need only to multiply the amperes by the volts. The Radio Amateur's Hand Book The milliampere is one thousandth of an ampere. The Story of Electricity COULOMB.—The quantity of electricity transferred by a current of 1 ampere in 1 second. The Radio Amateur's Hand Book Screw in a pair of 5 ampere fuse plugs, close the switch and you are ready to tune the transmitter and talk to your friends. The Radio Amateur's Hand Book A seven plate cell is thus designated as a 7 FPL cell, which has an 80 ampere hour capacity at the 8 hour continuous discharge rate. The Automobile Storage Battery Its Care And Repair The ampere-hour is the quantity of electricity transferred by a current of 1 ampere in 1 hour and is, therefore, equal to 3600 coulombs. The Radio Amateur's Hand Book QUANTITY—Q.—The Coulomb is the quantity of electricity conveyed by an ampere in a second. The Story of Electricity A single tube will develop 2 to 3 amperes in your aerial. The Radio Amateur's Hand Book The henry is the inductance in a circuit in which the electromotive force induced is 1 volt when the inducing current varies at the rate of 1 ampere per second. The Radio Amateur's Hand Book The capacity of storage battery cells is rated in ampere hours, while power consumed by lights, motors, etc., is measured in watt hours, or kilowatt hours. The Automobile Storage Battery Its Care And Repair The ampere is the current which when passed through a solution of nitrate of silver in water according to certain specifications, deposits silver at the rate of 0.00111800 of a gram per second. The Radio Amateur's Hand Book For example, if we know the electromotive force or difference of potential in volts and the resistance in ohms of an electric circuit, we can easily find the current in amperes. The Story of Electricity It is made in three sizes and for the transmitter here described you want the smallest size, which has an output of 1/2 to 1-1/2 amperes. The Radio Amateur's Hand Book The joule is the energy spent in I second by a flow of 1 ampere in 1 ohm. The Radio Amateur's Hand Book If the current is not drawn from the battery continuously for 8 hours, but is used for shorter intervals intermittently, the ampere hour capacity of the battery will be somewhat greater. The Automobile Storage Battery Its Care And Repair This product of the current in amperes times the number of turns of wire on the coil is called the ampere-turns. The Radio Amateur's Hand Book The heat in therms generated in a wire by a current = Volt X ampere X time in seconds X 0.24. The Story of Electricity The watt is the power spent by a current of 1 ampere in a resistance of 1 ohm. The Radio Amateur's Hand Book The Aerial Ammeter.—This is the same kind of a hot-wire ammeter already described in connection with the experimental set, but it reads to 5 amperes. The Radio Amateur's Hand Book One ampere per plate in each cell is a safe value of current to use. The Automobile Storage Battery Its Care And Repair The filament takes a current of a little more than 2 amperes at 7.5 volts. The Radio Amateur's Hand Book VOLT.—The electromotive force which produces a current of 1 ampere when steadily applied to a conductor the resistance of which is one ohm. The Radio Amateur's Hand Book AMPERE-HOUR.—The quantity of electricity transferred by a current of 1 ampere in 1 hour and is, therefore, equal to 3600 coulombs. The Radio Amateur's Hand Book The smallest A or 6 volt storage battery on the market has a capacity of 20 to 40 ampere hours, weighs 13 pounds and costs about $10.00. The Radio Amateur's Hand Book Ammeter should show three to five amperes charge with lamps burning. The Automobile Storage Battery Its Care And Repair A rheostat that has a resistance of 6 ohms and a current carrying capacity of 1.5 amperes which can be mounted on a panel board is the right kind to use. The Radio Amateur's Hand Book |
| 随便看 |
|
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。