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| The phenomenon of inducing voltage by changing the magnetic field in loops of wire is called |
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Definition
| electromagnetic induction |
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Term
| The amount of current produced by electromagnetic induction depends on |
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Definition
| the induced voltage and on the resistance of the coil and the circuit to which it is connected |
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Term
| The induced voltage in a coil is proportional to the product of its number of loops, the cross-sectional area of each loop and the rate at which the magnetic field changes within the loops |
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Term
| The machine that produces electric current, usually by rotating a coil within the stationary magnetic field |
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Term
| A device for transferring electric power from one coil of wire to another, by means of electromagnetic induction, for the purpose of transforming one value of voltage to another |
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Term
| Large currents in wires produce heat and energy losses, so power is transmitted great distances at high voltages and low curents |
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Definition
| power transmission (power = voltage x current) |
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Term
| current-carrying loops in a coil interact with loops of other coils. Each loop interacts with the magnetic field around the current in other loops of the same coil |
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Term
| the step-up transformer in an electric circuit can step up |
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Term
| Electricity and Magnetism connect to form |
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Term
| The difference between dc and ac in electrical circuits is that in dc, charges flow |
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Term
| A motor and generator are |
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Term
| A galvanometer can be calibrated to read |
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| either current or voltage |
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Term
| Compared with power input, the power output of an ideal transformer is |
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Term
| To receive an electric shock there must be a |
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Definition
| voltage difference and low body resistance |
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Term
| A magnetic force acting on a beam of electrons can change its |
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