GNU Collaborative International Dictionary of English

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  1.       
Alternating current. (Elec.) A current which periodically changes or reverses its direction of flow, especially an electric current that reverses direction sinusoidally, as is used for most domestic and industrial power requirements.  Contrasted with direct current.

    Syn. -- AC

    [Webster 1913 Suppl. +PJC]

    The common household current is alternating.  Alternating current is easier than direct current to transform to high voltage and back, making long-distance transmission more efficient.

    [PJC]

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