Electrical Potential and E.M.F

The unit of electric potential is the volt (V), where one volt is one joule per coulomb. One volt 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, i.e.

$\begin{aligned} \text { volts } & =\frac{\text { watts }}{\text { amperes }}=\frac{\text { joules } / \text { second }}{\text { amperes }} \\ & =\frac{\text { joules }}{\text { ampere seconds }}=\frac{\text { joules }}{\text { coulombs }} \end{aligned}$

A change in electric 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 battery or a generator is measured in volts.

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