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State which of the following is correct.

1. Joule = coulomb × volt
2. Joule = coulomb / volt
3. Joule = volt × ampere
4. Joule = volt / ampere

Correct answer: Joule = coulomb × volt

Solution

Electric potential difference is defined as work done per unit charge: $V=W/Q$. Therefore $W=QV$. Since work is measured in joules, $1\,\text{J}=1\,\text{C}\times 1\,\text{V}$.

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