Electromotive force

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Electromotive force

The electromotive force of a cell is measured in volts and may be regarded as the sum total of the potential differences which  it can produce across all the various components of a circuit in which it is connected including the potential difference
required to drive the current through the cell itself. The e.m.f. of a cell in volts is therefore defined as the total work done in joules per coulomb of electricity conveyed in a circuit in which the cell is connected.

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Electromotive force