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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