# Electromotive Force - e.m.f

## Change in electrical potential between two points

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A change in electrical potential between two points in an electric circuit is called a "potential difference". The "electromotive force (e.m.f)" provided by a source of energy - such as a generator or battery - is measured in volts.

One volt i one joule per coulomb and is defined as the difference in potential between two points in a conductor which, when carrying a current of one ampere, dissipates a power of one watt:

*volts = watts / amperes = (joules/sec) / amperes = joules / ampere seconds = joules / coulombs*

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