| 单词 | ammeter |
| 例句 | Some of the meters in automobile dashboards, digital cameras, cell phones, and tuner-amplifiers are voltmeters or ammeters. College Physics for AP Courses 2015-08-12T00:00:00Z But this is only a first step: the set-up would not be practical for calibrating current-measuring ammeters, which need to run at higher currents. Ampere to get rational redefinition 2014-01-15T18:20:56.465Z From little laser things that allow you to size up a room quickly through to gizmos to measure atmospheric pressure, humidity, gas levels in the atmosphere, ammeters and voltmeters. Google Motorola's Project Ara Might Well Work Best For Things That Are Not Smartphones 2013-10-29T16:45:00Z The method by which this tuning is achieved is to insert in the portion of the aerial below the spark balls, between it and the earth, a hot wire ammeter of some form. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z 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 By connecting resistors to this galvanometer in different ways, you can use it as either a voltmeter or ammeter that can measure a broad range of voltages or currents. College Physics for AP Courses 2015-08-12T00:00:00Z Other Tools and Equipment As you go along in electrical work, you'll be adding tools and other equipment, such as a trouble light and maybe an ammeter or voltmeter. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z The sensitiveness of such a thermal ammeter can be made sufficiently great to detect a current of a few microamperes. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Accordingly, the inductance and capacity of the lateral branch of the transmitter is altered until the hot wire ammeter in the base of the aerial shows the largest possible current. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z The switchboard at a generating station is always supplied with instruments called ammeters, an abbreviation of amperemeters, for the purpose of measuring the current passing out from the dynamos. 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 Since the shunt resistance is small, most of the current passes through it, allowing an ammeter to measure currents much greater than those producing a full-scale deflection of the galvanometer. College Physics for AP Courses 2015-08-12T00:00:00Z Other related instruments are the voltmeter and ammeter. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z The Duddell thermal ammeter is another very sensitive form of alternating current galvanometer. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z The fifth class comprises the electromagnetic or electro-dynamic instruments, which are virtually very sensitive alternating-current ammeters, adapted for immensely high frequency. Hertzian Wave Wireless Telegraphy 2012-01-09T03:00:20.570Z Another kind of ammeter known as a thermo-ammeter works on quite a different principle. 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 ammeter is placed in series in the branch of the circuit being measured, so that its resistance adds to that branch. College Physics for AP Courses 2015-08-12T00:00:00Z Ask him or an electrician to give you a demonstration of a split-core ammeter. Electricity for the 4-H Scientist Idaho Agricultural Extension Service Bulletin 396, June, 1962 2011-11-18T03:00:30.487Z One and the same instrument may be used as an ammeter or as a voltmeter, by providing it with shunts for use as an ammeter, and series resistances for use as a voltmeter. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Galvanometers, ammeters, voltmeters, all our delicate instruments, including the chemical balanced, had been rendered inaccurate, hence useless until re-calibrated. I Walked in Arden 2011-04-10T02:00:06.137Z Current measuring instruments depending on this fact, called hot-wire ammeters, are in common use, especially for measuring alternating currents. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z Normally, the ammeter’s resistance is very small compared with the resistances of the devices in the circuit, and so the extra resistance is negligible. College Physics for AP Courses 2015-08-12T00:00:00Z He invented an ammeter, voltmeter, &c., in conjunction with Professor Perry. The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis The "soft-iron" ammeter can be used for both direct and alternating currents, is inexpensive, and is sufficiently accurate for commercial use. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli A is the aerial, E earth, T inductance, L ammeter. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 Instruments called galvanometers and ammeters for the most part operate on this principle. Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 2 "Ehud" to "Electroscope" 2011-01-29T03:00:23.777Z One solution to the problem of voltmeters and ammeters interfering with the circuits being measured is to use galvanometers with greater sensitivity. College Physics for AP Courses 2015-08-12T00:00:00Z This is easily avoided by watching the ammeters to see that the input is not in too great excess of the output, and if necessary, by frequently stopping the machines to avoid this. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. In cases where absence of inductance in the instrument is important, e.g. in the measurements in wireless-telegraph and telephone circuits, the "hot-wire" ammeter is used. The New Gresham Encyclopedia. Vol. 1 Part 2 Amiel to Atrauli A is the aerial; T, the inductance; E, earth; L, hot-wire ammeter. Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 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 Null measurements are generally more accurate but are also more complex than the use of standard voltmeters and ammeters, and they still have limits to their precision. College Physics for AP Courses 2015-08-12T00:00:00Z 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. 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 Similarly an alternating current ammeter can be calibrated by comparison with an electrodynamometer, the reading of which varies as the square of the current. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 1 "Calhoun" to "Camoens" Should your receiver fail to operate, first check the fuse located in the fuse holder in the ammeter cable. Delco Manuals: Radio Model 633, Delcotron Generator Delco Radio Owner's Manual Model 633, Delcotron Generator Installation An ammeter is placed in series to get the full current flowing through a branch and must have a small resistance to limit its effect on the circuit. College Physics for AP Courses 2015-08-12T00:00:00Z The ammeter, with suitable connections, enables the battery-charge rate to be kept normal and the battery discharge to be observed. Cyclopedia of Telephony and Telegraphy, Vol. 2 A General Reference Work on Telephony, etc. etc. 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 We could make one in the same way as we made the ammeter of the last letter but there are other better ways of which I’ll tell you later. Letters of a Radio-Engineer to His Son Eliminating Motor Interference— Connect the ammeter condenser to the spring clip at the end of the wire containing the fuse holder by means of the self-threading screw on the side of the spring clip. Delco Manuals: Radio Model 633, Delcotron Generator Delco Radio Owner's Manual Model 633, Delcotron Generator Installation Standard voltmeters and ammeters alter the circuit being measured and are thus limited in accuracy. College Physics for AP Courses 2015-08-12T00:00:00Z The charging rate may be measured by connecting an ammeter in series with the battery and increasing the engine speed until the maximum current is obtained. The Automobile Storage Battery Its Care And Repair A touch of the ammeter showed that no one was on the line. The Velvet Glove The ammeters and voltmeters which we use for the measurement of audion characteristics and the like are usually electromagnetic instruments. Letters of a Radio-Engineer to His Son The electrical power they could measure accurately and easily by simple voltmeters and ammeters. Empire What would happen if you were measuring voltage but accidentally put the meter in the ammeter mode? College Physics for AP Courses 2015-08-12T00:00:00Z Each circuit is provided with a separate rheostat and ammeter. The Automobile Storage Battery Its Care And Repair An ingenious mechanic can construct such a radiator, experimenting with the aid of an ammeter to ascertain the length of wire required for any given stove. Electricity for the farm Light, heat and power by inexpensive methods from the water wheel or farm engine After we had done so we would call it an “ammeter” because it measures amperes. Letters of a Radio-Engineer to His Son The technicians checked their recording voltmeters and ammeters and reported that, sure enough, some ten kilowatts of power at a little less than one hundred fifteen volts D.C. was coming from the Black Suitcase. With No Strings Attached To produce a galvanometer for use in analog voltmeters and ammeters that have a low resistance and respond to small currents, we use a large loop area A , high magnetic field B , and low-resistance coils. College Physics for AP Courses 2015-08-12T00:00:00Z An ammeter should be attached with the engine running and the battery charging, first to one section and then to each of the others in turn. The Automobile Storage Battery Its Care And Repair Then came the instruments of precision—the electrometer, the resistance bridge, the ammeter, the voltmeter—all of the utmost value in the science. Electricity for Boys If we had a very carefully made ammeter we would send it to the Bureau of Standards to be calibrated. Letters of a Radio-Engineer to His Son The blue-lighted corridor with its rippling sounds of static and its gigantic ammeters became worse than a shambles. The Winged Men of Orcon A Complete Novelette The circuit shown in the figure below includes a resistor R in series with a battery along with an ammeter and voltmeter to measure the current and voltage respectively. College Physics for AP Courses 2015-08-12T00:00:00Z The ammeter should be inserted and removed from the circuit while the engine remains running and all conditions must be exactly the same; otherwise the comparative results will not give reliable indications. The Automobile Storage Battery Its Care And Repair A relay snapped, and instantly the ammeter jumped to read 4500 amperes. Islands of Space Connect it in series with a battery and an ammeter as shown in Fig. Letters of a Radio-Engineer to His Son I motioned unobtrusively toward the end of the room, where a tunnel, blue-lighted and lined with curious, glittering dials like ammeters, gave entrance, evidently, to another great underground chamber. The Winged Men of Orcon A Complete Novelette The ammeter would have the same reading if located between points d and e or between points f and a as it does in the position shown. College Physics for AP Courses 2015-08-12T00:00:00Z It would be better still to use two ammeters at the same time, one on each section of the battery. The Automobile Storage Battery Its Care And Repair The heavy coronium spring grew warm and began to glow dully, while the ammeter dropped slightly because of the increased resistance. Islands of Space 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 In moments the ammeter connected with the disrupter beam began to rise so rapidly that Morey watched it with some concern. The Black Star Passes Figure 21.33 A small shunt resistance R placed in parallel with a galvanometer G produces an ammeter, the full-scale deflection of which depends on the choice of R . College Physics for AP Courses 2015-08-12T00:00:00Z The twenty battery Tungar uses two bulbs, each of which is the same as that used in the ten battery Tungar, and has two charging circuits, having an ammeter and regulating switch for each circuit. The Automobile Storage Battery Its Care And Repair He threw another switch which shorted around the coronium resistor and the ammeter, allowing the current to run into the coil directly from the plate. Islands of Space To measure a current we may connect into the circuit an ammeter. Letters of a Radio-Engineer to His Son They were all up to capacity, save the ammeter from the coils. Invaders from the Infinite Ideally, voltmeters and ammeters do not appreciably affect the circuit, but it is instructive to examine the circumstances under which they do or do not interfere. College Physics for AP Courses 2015-08-12T00:00:00Z If the current on the ammeter is high and cannot be reduced: The ammeter pointer may be sticking; tap it lightly with the hand. The Automobile Storage Battery Its Care And Repair The elder Dr. Arcot glanced in surprise at the heavy-duty ammeter in a control panel. Islands of Space We now have a different value of EC and will find a different value of IB when we read the ammeter. Letters of a Radio-Engineer to His Son An ammeter on the wall caught Bennie's attention. The Man Who Rocked the Earth A practical problem can occur if the ammeter is connected incorrectly. College Physics for AP Courses 2015-08-12T00:00:00Z If only one three-cell battery is being charged, and the alternating-current supply is slightly high, then the current on the ammeter may be high. The Automobile Storage Battery Its Care And Repair Beginning at the top and enumerating them in order these instruments are: Three ammeters, one for each phase, a volumeter, an indicating wattmeter, a power factor indicator and a field ammeter. The New York Subway Its Construction and Equipment Suppose we set up our circuit L-C with an ammeter in it, so as to be able to tell how large an electron stream is oscillating in that circuit. Letters of a Radio-Engineer to His Son The ammeter, A2, is directly connected to the dynamo, and therefore indicates the current, whatever circuit this machine is running. Scientific American Supplement, No. 711, August 17, 1889 This allows construction of voltmeters with greater resistance and ammeters with smaller resistance than when less sensitive galvanometers are used. College Physics for AP Courses 2015-08-12T00:00:00Z If this causes the voltmeter pointer to return to the "0" line, the switch which connects the generator or motor-generator to the ammeter or indicator is defective. The Automobile Storage Battery Its Care And Repair The panel which carries the standard instruments also carries ammeters used to measure current to auxiliary circuits in the power house. The New York Subway Its Construction and Equipment We read the ammeter in the plate circuit and note what that current is. Letters of a Radio-Engineer to His Son The scale may be completed by marking the positions of the pointer when other currents of known strength flow through the ammeter. General Science Two configurations for ohmmeters using standard voltmeters and ammeters are shown in Figure 21.39. College Physics for AP Courses 2015-08-12T00:00:00Z If the ammeter needle jumps back and forth and the cutout opens and closes rapidly, the polarity of the battery and that of the generator are not the same. The Automobile Storage Battery Its Care And Repair For the feeder board, instruments of the round dial pattern are used, and for each feeder a single instrument is provided, viz., an ammeter. The New York Subway Its Construction and Equipment We read the voltmeter in the plate circuit and the ammeter in that circuit. Letters of a Radio-Engineer to His Son All electric plants, whether for heating, lighting, or for machinery, are provided with ammeters, such instruments being as important to an electric plant as the steam gauge is to the boiler. General Science To measure currents in Figure 21.52, you would replace a wire between two points with an ammeter. College Physics for AP Courses 2015-08-12T00:00:00Z 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 Each horizontal row comprises the ammeter belonging to feeders which are supplied through a given group switch. The New York Subway Its Construction and Equipment Suppose that we now make it 50 volts and then vary the position of the slider in the grid circuit until the ammeter reads as it did at the start. Letters of a Radio-Engineer to His Son With a high resistance in the outside circuit, the deflections of the ammeter will be small, but such as they are, they will fairly accurately represent the electromotive forces which produce them. General Science So delicate was the test that the observers could detect the presence of a warm bearing in the separator from the change in the readings of the ammeter. Scientific American Supplement, No. 841, February 13, 1892 Should the ammeter indicate "charge" the battery connections have been reversed, or the ammeter connections are reversed. The Automobile Storage Battery Its Care And Repair Take corresponding readings on a standard ammeter and mark the figures on the dial. The Boy Mechanic: Volume 1 700 Things for Boys to Do 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 In external appearance they are not distinguishable from ammeters. General Science One ammeter, for measuring the quantity of current output, was interpolated in the "neutral bus" or third-wire return circuit to indicate when the load on the two machines was out of balance. Edison, His Life and Inventions The ammeter should indicate some charging current at engine speeds corresponding to the usual speed at which the car is driven. The Automobile Storage Battery Its Care And Repair The volt side of the dial may be calibrated in the same manner, using a voltmeter instead of the ammeter. The Boy Mechanic: Volume 1 700 Things for Boys to Do Then we read the ammeter in the plate circuit to find the value of IB which corresponds to this condition of the grid. Letters of a Radio-Engineer to His Son Instruments for measuring the strength of currents in units are called ammeters, and the common form makes use of a galvanometer. General Science I had a Hot Wire ammeter and always tuned for maximum deflection, completely oblivious of the fact that a large proportion of the indicated value was 'reflected power'. The Dawn of Amateur Radio in the U.K. and Greece: a personal view 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 This is done by connecting it in series with another standard ammeter which has the scale marked in known quantities. The Boy Mechanic: Volume 1 700 Things for Boys to Do In the case of ammeters we sometimes let all the current go through the current-measuring part but generally we let only a certain fraction of it do so. Letters of a Radio-Engineer to His Son But his chuckle was not so rotund, and he was very attentive to the ammeter. Main Street On the same photograph the ammeter needle does not appear, its incessant and large movements preventing any picture from being formed. The Project Gutenberg Encyclopedia Volume 1 of 28 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 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 Because the plunger in an alternating-current ammeter is soft iron its loops line up with those of the coil no matter which way the electron stream happens to be going in the coil. Letters of a Radio-Engineer to His Son Profs. Ayrton and Perry lately described and exhibited before the Physical Society their new ammeters and voltmeters, also a non-sparking key. Scientific American Supplement, No. 433, April 19, 1884 "Try your ammeter," suggested Darrow, who had followed. The Sign at Six Such a rheostat is on the market and may be purchased complete with ammeter and leads for attaching to the battery. The Automobile Storage Battery Its Care And Repair The microphone can be connected in the ground wire and the ammeter in the aerial wire and the results will be practically the same. The Radio Amateur's Hand Book We get a new pair of values for EC and IB, getting EC from the voltmeter and IB from the ammeter. Letters of a Radio-Engineer to His Son 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 Surreptitiously he applied the slender cords of his pocket ammeter to the zinc and carbon of the dead batteries concerning whose freshness he and his assistant had argued. The Sign at Six To determine whether the cutout is defective, remove the wires from it and hold together the ends of the wires coming from the generator, and the one going to the ammeter. The Automobile Storage Battery Its Care And Repair MILLI-AMMETER.—An ammeter that measures a current by the one-thousandth of an ampere. The Radio Amateur's Hand Book It is our symbol for whatever an ammeter would read, that is for the amount of current. Letters of a Radio-Engineer to His Son By means of an ammeter and voltmeter used conjointly, the resistance of part of the circuit, say a lamp or heated wire, can be got by Ohm's law. Scientific American Supplement, No. 433, April 19, 1884 Garrick carefully tested the batteries with a little ammeter which he carried in a case. Guy Garrick An ammeter may be left connected in series with the battery, providing that a switch is used to short-circuit the meter while starting the engine. The Automobile Storage Battery Its Care And Repair The ammeter is connected in the aerial wire system, either in the aerial side or the ground side—the latter place is usually the most convenient. The Radio Amateur's Hand Book If we use a variable plate condenser it will have a scale on top graduated in degrees and we can note the reading of the ammeter for each position of the movable 120 plates. Letters of a Radio-Engineer to His Son Then turn the regulating switch slowly to the right, and, as soon as the batteries commence to charge, the needle on the ammeter will indicate the charging current. The Automobile Storage Battery Its Care And Repair If the bulb lights but no current shows on the ammeter: Examine the connections to the batteries, and also the connections between them. The Automobile Storage Battery Its Care And Repair After a slight movement of the ammeter pointer indicates that the cutout has closed, speed up the engine gradually. The Automobile Storage Battery Its Care And Repair When you tune the transmitter so that the ammeter shows the largest amount of current surging in the aerial wire system you can consider that the oscillation circuits are in tune. The Radio Amateur's Hand Book A voltmeter shows the value of this e. m. f. and an ammeter tells the strength of the electron stream. Letters of a Radio-Engineer to His Son The ammeter will not indicate the current correctly if the pointer is not on the zero line when the Tungar is not operating. The Automobile Storage Battery Its Care And Repair 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 If no other trouble exists, the ammeter will indicate a charging current at speeds above 8-10 miles per hour. 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 To do this you need only to use a voltmeter across the filament terminals instead of an ammeter in series with it; then regulate the voltage of the filament with a rheostat. The Radio Amateur's Hand Book To adjust the transmitter so that the circuits will be in tune you should have a hot wire ammeter, or radiation ammeter, as it is called, which is shown in Fig. 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 With the constant potential system of charging, the ammeters are furnished with the motor-generator set. The Automobile Storage Battery Its Care And Repair Such an instrument is often called a thermal ammeter, radio ammeter and aerial ammeter. The Radio Amateur's Hand Book Don't operate a transmitting set without a hot-wire ammeter in the aerial. The Radio Amateur's Hand Book |
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