The potential difference across a cell may be:
- Electromotive Force (emf) is the maximum potential difference between the terminals of a cell when there is no current flowing inside it.
- As soon as a current starts to flow, the potential difference in the cell decreases.
- Hence, the p.d. may be equal to the emf but cannot exceed it.
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The potential difference across a cell may be:
(3) Equal to its emf
- Electromotive Force (emf) is the maximum potential difference between the terminals of a cell when there is no current flowing inside it.
- As soon as a current starts to flow, the potential difference in the cell decreases.
- Hence, the p.d. may be equal to the emf but cannot exceed it.