# Shared Flashcard Set

## Details

Chapter 25
Electromagnetic Induction
15
Physics
10/13/2011

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
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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