Definition: Electromotive force (e.m.f.) is fundamentally a potential difference. It is defined as the energy provided by a cell or battery per coulomb of charge passing through it, or simply work done per unit charge .
Mathematical Formula: The relationship is given by ε=qW, where W is work done and q is charge .
Unit Derivation:
The SI unit for Work (W) is the Joule (J).
The SI unit for Charge (q) is the Coulomb (C).
Therefore, the unit for e.m.f. is Joule/Coulomb (J C−1).
Standard Unit: This derived unit is equivalent to the Volt (V) .
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