dynamo (generator) Device that converts mechanical energy into electrical energy by the principle of electromagnetic induction that uses magnetism to produce an electric current. In a simple dynamo, a conductor, usually an open coil of wire (armature), is placed between the poles of a permanent magnet. This armature is rotated within the magnetic field, inducing an electric current. See also alternator
dy·na·mo / ˈdīnəˌmō/ • n. (pl. -mos) a machine for converting mechanical energy into electrical energy; a generator. ∎ inf. an extremely energetic person: she was a dynamo in London politics.
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