electromotive force
Britannica Concise Encyclopedia | Date: 2007
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 ) and is characteristic of any energy source capable of driving electric charge around a circuit. A common unit of electromotive force is the volt , 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.
Copyright 1994-2007 Encyclopedia Britannica, Inc.
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