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9Sci CH22

9th Science CH22 Magnetism and Its Uses

alternating current (AC) electric current that reverses its direction in a regular pattern;the 60-Hz AC in our homes changes direction 120 times each second
ammeter a galvanometer that measures electrical current passing through in amperes; connected in series with the circuit
direct current (DC) electrical current that flows in only one direction through a wire
electric motor a device that contains a rotating electromagnet that changes electrical energy to mechanical energy
electromagnet strong temporary magnet made by inserting an iron core into a wire coil and passing an electric current through the coil
electromagnetic induction process by which electrical current is induced in a wire when it is moved through a magnetic field
generator a device that uses electromagnetic induction to induce electrical current by rotating loops of wire through a magnetic field
magnetic domain groups of atoms with aligned magnetic poles
magnetic field the region around a magnet where magnetic forces act
magnetic pole the two ends of a piece of magnetic material where the magnetic forces are strongest, labeled north pole (N) and south pole (S)
magnetism a property of some materials in which there is a force of repulsion or attraction between certain like and unlike poles
superconductor a supercooled material that has no electrical resistance ; a current can flow indefinitely through a superconductor without losing energy
transformer a device that can increase or decrease the voltage of an alternating current
voltmeter a galvanometer that measures potential differences in volts and is placed in parallel across a part of the circuit