alternating current (a.c.) - Current which changes direction many times each second., direct current (d.c) - Current that always flows in the same direction., potential difference (p.d.) - The difference in the energy carried by electrons before and after they have flowed through a component. Another term for voltage., induce - To create. For example, a wire in a changing magnetic field has a current induced in it., generator - A machine that produces electricity by rotating coils of wire in a magnetic field (or by rotating magnets near a coil of wire)., alternator - A generator that produces alternating current., dynamo - A generator that uses a commutator to change its output from alternating current to direct current., carbon brush - A block of carbon that makes electrical contact between a circuit and a moving object such as a slip ring or commutator., commutator - A commutator switches over the connections every half-turn of the coil so the output is a form of direct current., slip ring - Metal rings connected to the rotation coil in a generator. They make electrical contact with an external circuit., loudspeaker - A machine for converting changes in electrical current or voltage into sound waves., microphone - A machine for converting sound waves into changes in electrical current or voltage.,

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