Physics – 4.2.3 Electromotive force and potential difference | e-Consult
4.2.3 Electromotive force and potential difference (1 questions)
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Definition: Potential difference (p.d.) is defined as the work done per unit charge when a charge moves between two points in an electric circuit. More formally, it is the work done (W) by a unit positive charge (q) moving between two points. This can be expressed as: V = W/q.
Units: The SI unit of potential difference is the volt (V). The volt is equivalent to joules per coulomb (J/C), meaning that 1 volt is the energy required to move 1 joule of charge through a 1 coulomb potential difference.