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.
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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