Hence, while both volts and amperes are widely different in the two circuits, the watts for each are the same in the ideal case, that is, assuming perfect transformer action or 100% efficiency.
By adjusting the counterweight for a given number of amperes required by the arc, the current will be maintained constant by the movement of the secondary coil.
The table of Steinmetz on page 1,464 gives the values of the alternating volts and amperes in units of direct current.
The regulating switch may have to be adjusted occasionally during charge, if it be desired to maintain charging amperes approximately constant.
The common battery tester does not always give the exact number ofamperes of current, but it indicates the relative strength which is really the thing desired.
The quantity of electricity used up in such a lamp is expressed in watts, which is the product of the volts and amperes of the circuit.
The amperes of current determine the rate at which the electricity is being used in any circuit.
A cell that indicates less than 5 amperes should be replaced.
All fuses for branch circuits shall be not more than 10 amperes capacity.
In all cases the product of the number of amperes and the number of hours constitute the ampere-hours of energy produced.
If, however, an electric heater requiring 7 amperes were attached to the circuit, the fuse being intended for only 5 amperes would soon burn out.
In all cases the product of the volts and amperes give the capacity of the lamp in watts.
If an iron requiring 5 amperes of current is attached to a circuit that is intended to carry only 3 amperes the conducting wires will be overheated and may be the cause of serious results.
As an example: a 2-ampere fuse will carry 2 amperes of current without noticeable heating, but at a dangerous overload the fuse will melt and the circuit be broken.
The “strength” of a cell is determined by theamperes of current it is capable of producing; therefore, a meter that will indicate the amount of current being produced is used to test the current strength of the cell.
The quantity of electricity being used in any circuit is the product of the volts of pressure and amperes of current flowing through the wires.
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.
A run was made with 1 ampere and then with 2 amperes for one hour.
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.
The brass frame is wound with magnet wire, the size depending on the number of amperes to be measured.
These cells having been "run out" beyond the required number ofamperes for automobile use, will give excellent service, considering their cost.
For other angles the value of the current may be found from the following table: Angles Degrees Current Amperes 10 .
This toaster will take four amperes on 110-volt circuit.
By multiplying volts and amperestogether we get watts.
If an electric toaster uses 5 amperes at 115 volts, how much heat will this develop in half an hour?
Ohm's law, one of the most important laws of electricity, states that, in any circuit, the current in amperes equals the electromotive force in volts divided by the resistance in ohms.
Ohm's law produce a current of 2 amperes through a resistance in the circuit of 4 ohms.
A certain arc lamp required 10 amperes of current at 45 volts pressure.
As the coil turns it moves a pointer attached to it across a scale graduated to indicate the number of amperes in the whole current.
Now the number of joules of electrical energy in an electric circuit is expressed by the following formula: Joules = volts x amperes x seconds, or since 1 joule = 0.
A new dry cell may send 20 amperes through a testing meter.
This represents the electrical energy in joules, or Joules = volts x amperes x seconds, or j = E x I x t.
They even managed to get six hundred amperes through a piece of lead wire no bigger than a pencil lead.
Twice as much coal must be consumed to furnish two amperes as one, and twice as much coal must be consumed to furnish an ampere for two hours as for one hour.
In this case the drop in voltage would be 5 amperes x 5 ohms = 25 volts.
The rails of railroads are welded end to end by a current of several thousand amperes sent through the joint by perhaps two or three volts.
It will register the same amount whether we use one ampere for one hour or half an ampere for two hours or two amperes for half an hour.
The drop in voltage is found by multiplying the amperes of current by the ohms of resistance.
The ammeter in the engine room showed that 7 amperes of electricity were sent through the motor of the elevator to bring us up.
After being used about two months upon the motor boat these cells develop more internal resistance, and they will then show not more than six to ten amperes when short circuited through an ammeter.
Using 4 amperes for 10 minutes cost two thirds of a cent.
Amperes of electricity are analogous to gallons of water.
Suppose, for instance, I needed to supply fifty amperes at one hundred-volt pressure ten miles distant from the generator, and had a conductor the size of a trolley wire to bring the current.
Illustration: Showing the analogy of water to volts and amperes of electricity] The same is true in figuring the power of electricity.
To charge this battery would require a dynamo capable of delivering 10 amperes of current for 9 hours.
Not more than 6 amperes should be used on any single branch circuit.
Thus, this battery should be charged at the rate of 7-1/2 amperes for 8 hours, with another hour added to make up for losses that are bound to occur.
Three ampereswould require a wire of at least 1,500 circular mills in area for safety.
It has enough resistance to make it hot as soon as too many amperes flow through; and it has such a low melting point that as soon as it gets hot it melts in two, or blows out.
First, it has enough resistance to electricity so that if manyamperes (much current) flow through, it gets heated.
Can the zinc shaving stand as many amperes as the fuse wire you ordinarily use?
When are the greater number of amperes of electricity flowing through the zinc shaving?
The fuse wire across the fuse gap allows about 8 amperes to pass through before it melts.
If this happens at your home, examine the fuse and see how many amperes (how much current) it will allow to flow through it.
To find the power of an electric current in terms of horse-power, find the number of watts by multiplying the volts by the amperes and divide the watts by 746 and the result will give you the horse-power of the current.
Multiplying the volts by the amperesgives what is called watts, and there would be 80 watts in each case.
As the current to be interrupted amounts to about tenamperes and is flowing in a highly inductive circuit, the spark at break is considerable.
It is not in general practicable to work coils larger than the ten-inch size with a platinum contact hammer break, as such a butt contact becomes overheated and sticks if more than ten amperes is passed through it.
As the ten-inch coil takes a primary current of ten amperesat sixteen volts when in operation, it requires very substantial platinum contacts to withstand the interruption of this current continuously without damage.
To measure the current inamperes an instrument called an ammeter is used, as shown at A in Fig.
This product of the current in amperestimes the number of turns of wire on the coil is called the ampere-turns.
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.
A single tube will develop 2 to 3 amperes in your aerial.
If the current is multiplied by the amperes a factor is obtained, called Watts.
Now the different arrangement of volts and amperes does not mean that the current strength is changed in the batteries or in the cells.
Thus, as given by several manufacturers, the normal charging rate for a cell of 40 ampere hours should be five amperes, or one-eighth of its ampere hour rating in amperes of charging current.
One manufacturer states that it is not advisable to build knife flashers for more than 15 amperes per double pole switch, as they cannot be depended upon to break a greater load for any length of time.
The ampere feet of a main are found by multiplying the maximum load in amperes by the distance from the fuse block to the electrical center of the load.
The brush type, as its name indicates, is of brush construction and is limited to 5 amperes capacity on each switch.
Multiply current in amperes by single distance and refer to the nearest corresponding number under column of actual volts lost, to find size of wire.
Swan has succeeded in depositing excellent copper at current-densities exceeding 1000 amperesper sq.
Whilst the jet was playing, a good deposit was formed with so high a current-density as 280 amperes per sq.
The current from a Wilde's dynamo was passed, apparently with a current density of 5 or 6 amperes per sq.
The brushes are proportioned for a carrying capacity of not more than 25 amperes per square inch of brush surface.
Three quarters of the brush area is in contact with segment B and one quarter with segment A; accordingly, 30 amperes will flow through B and 10 amperes through A.
A, and from the left, 10 amperes through the short circuited coil via A and 10 amperes through B.
A one hundred ampere fuse may be made by taking four wires of twenty-five amperes capacity.
Fuses are sometimes rated according to the number of amperes to be taken normally by the circuit they are to protect.
The brush now contacts equally with both segments, hence 20 amperes will flow through each segment.
One quarter of the brush area is in contact with B and three quarters in contact with A; hence, 10 amperes will flow through B and 30 amperes through A.
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.
The full current of three amperes should be allowed to pass through the winding for a few minutes after the object to be demagnetized is inserted, and then gradually reduced, and the object removed.
Illustration: The Amperes of a Fuse Reduced by Making a Nick in the Lead Wire] Dip-Plating Process The various ways of doing dip plating are practically the same method, the coating fluid consisting of essentially the same materials.
A low-resistance cell must be used here, as before mentioned, one that gives not less than 5 amperes on short circuit.
In this case a current density of 100 amperesat 1 volt is used.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "amperes" in a variety of sentences. We hope that you will now be able to make sentences using this word.
