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Energy per unit electric charge that is imparted by an energy source, such as an electric generator or a battery. As the device does work on the electric charge being transferred within itself, energy is converted from one form to another. The work done on a unit of electric charge or the energy gained by the unit charge is the electromotive force *emf* (or *math.E*) and is characteristic of any energy source capable of driving electric charge around a circuit. A common unit of electromotive force is the volt *math.V*, a unit equal to the difference in electric potential between two points in a conductor carrying a current of one ampere and dissipating one watt of power between the two points.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.

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Last updated on Sunday August 15, 2004 at 12:50:53 PDT (GMT -0700)

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This article is licensed under the GNU Free Documentation License.

Last updated on Sunday August 15, 2004 at 12:50:53 PDT (GMT -0700)

View this article at Wikipedia.org - Edit this article at Wikipedia.org - Donate to the Wikimedia Foundation

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