what is a electromotive force
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The electromotive force (e) or e.m.f. is the energy provided by a cell or battery per coulomb of charge passing through it, it is measured in volts (V). It is equal to the potential difference across the terminals of the cell when no current is flowing.
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Electromotive force, abbreviated emf, is the electrical intensity developed by a source of electrical energy such as a battery or generator. Sometimes an analogy to water "pressure" is used to describe electromotive force.
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