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Electromotive Force e.m.f.

The electromotive force or e.m.f. is a measure of the work done per unit charge by the cell.It is the amount of energy transferred by the cell to the charge carriers when 1 coulomb of charge passes through it.
ε = W
Q
The unit for e.m.f. is volts (V) as it is a measure of voltage or energy per unit charge.1 volt is the e.m.f. of a cell or power source that transfers 1 joule of energy per coulomb of charge that passes through it.

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Specification: Edexcel Physics (8PH0), AS-level, Topic 3: Electric Circuits. Topic: Electrical Quantities.

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