Electromotive force (emf)

The generic name given to any device that causes an electric current to flow continuously.

It is a physical quantity that characterizes the work of nonpotential forces in AC or DC sources. In a complete conductive circuit electromotive force equals the work of these forces on the movement of a single positive charge along the circuit.


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06/25/1824
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William Thomson, 1st Baron Kelvin

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