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Chapter 25
Electromagnetic Induction
15
Physics
Undergraduate 2
10/13/2011

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Term
The phenomenon of inducing voltage by changing the magnetic field in loops of wire is called
Definition
electromagnetic induction 
Term
The amount of current produced by electromagnetic induction depends on
Definition
the induced voltage and on the resistance of the coil and the circuit to which it is connected
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
Definition
Faraday's Law
Term
The machine that produces electric current, usually by rotating a coil within the stationary magnetic field
Definition
Generator 
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
Definition
Transformer
Term
Large currents in wires produce heat and energy losses, so power is transmitted great distances at high voltages and low curents
Definition
power transmission (power = voltage x current)
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
Definition
self induction
Term
the step-up transformer in an electric circuit can step up 
Definition
voltage
Term
Electricity and Magnetism connect to form
Definition
Light
Term
The difference between dc and ac in electrical circuits is that in dc, charges flow
Definition
in one direction 
Term
A motor and generator are
Definition
similar devices
Term
A galvanometer can be calibrated to read 
Definition
either current or voltage
Term
Compared with power input, the power output of an ideal transformer is 
Definition
the same
Term
To receive an electric shock there must be a 
Definition
voltage difference and low body resistance 
Term
A magnetic force acting on a beam of electrons can change its
Definition
Direction
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