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Dictionary of Electrical Engineering

Commonly used terms in the Electrical industry.

alternating current (AC)
a periodic current the average value of which over a period is zero.

alternating current machine
an electromechanical system that either converts alternating current electrical power into mechanical power (AC motor), or converts mechanical power into alternating current electrical power (AC generator, or alternator). Some AC machines are designed to perform either of these functions, depending on the energy source to the dynamo.