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14 Cards in this Set
- Front
- Back
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Alternating Current (AC)
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Electric current that reverses its direction in a regular; the 60-Hz AC in our homes changes 120 times each second.
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Ammeter
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A galvanometer that measures
electrical current passing through in amperes; connected in series with the circuit. |
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Direct Current (DC)
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Electrical current that flows in only one direction through a wire.
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Electric Motor
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A device that contains a rotating electromagnet that changes electrical energy to mechanical energy.
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Electromagnet
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Strong temporary magnet made by inserting an iron core into a wire coil and passing an electric current through the coil.
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Electromagnetic Induction
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Process by which electrical current is inducted in a wire when it is moved through a magnetic field.
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Generator
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A device that uses electromagnetic induction to induce electrical current by rotating loops of wire through a magnetic field.
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Magnetic Domain
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Groups of atoms with aligned magnetic poles.
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Magnetic Field
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The region around a magnet where the magnetic forces act.
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Magnetic Pole
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The two ends of a piece of magnetic material where the magnetic forces are strongest, labeled north pole (N) and south pole (S).
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Magnetism
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A property of some materials in which there is a force of repulsion or attraction between certain like and unlike poles.
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Superconductor
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A supercooled material that has no electrical resistance; a current can flow indefinitely through a superconductor without losing
energy. |
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Transformer
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A device that can increase or decrease the voltage of an alternating current.
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Voltmeter
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A galvanometer that measures potential differences in volts and is placed in parallel across a part of the circuit.
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