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16 Cards in this Set

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  • Back
ALTERNATING CURRENT
electric current that reverses its direction in a regualr pattern.
MAGNETISM
a property of some materials in which there is a force of repulstion or attration between certain like and unlike poles.
ELECTROMAGNETIC INDUCTION
process by which electrical current is induced in a wire when it is moved thrugh a magnetic field
ELECTRIC MOTOR
a device that contains a rotating electromagnet that changes electrical energy to mechanical energy
DIRECT CURRENT
electrical current that flows in only one direction through a wire
MAGNETIC FIELD
the region around a magnet where magnetic forces act
GENERATOR
device that uses electromagnetic induction to induce electrical current by rotating loops of wire through a magnetic field
CRITICAL TEMPERATURE
in superconductors, the very low temperature at which a material ceases to have any electical resistance.
TRANSFORMER
device that can increase or decrease the voltage of an alternating current
ELECTROMAGNET
strong temporary magnet made by inserting an iron core into a wire coil and passing an electric current through the coil
VOLTMETER
a galvanometer that measures potential differences in volts and is placed in parallel across a part of the circuit.
AC
alternating current
AMMETER
a galvanometer that measures electrical current passing through in amperes; connected in a series with the circuit
MAGNETIC DOMAINS
groups of atoms with aligned magnetic poles
MAGNETIC POLES
the 2 ends of a piece of magnetic material where the magnetic forces are strongest, labeled north pole and south pole
SUPERCONDUCTOR
supercooled material that has no electrical resistance. a current can flow indefinitely through a super conductor without losing energy