The unit of e.m.f. is:

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Accepted Answer

1. **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 .
2. **Mathematical Formula:** The relationship is given by $\varepsilon = \frac{W}{q}$, where $W$ is work done and $q$ is charge .
3. **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** (${	ext{J C}}^{-1}$).
4. **Standard Unit:** This derived unit is equivalent to the **Volt** (V) .

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