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What is the difference between emf and potential difference?

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Electromotive force

The emf is the energy supplied to unit charge by the cell or battery.

It is also defined as “the potential difference between the terminals of a battery when no current is flowing through an external circuit when the circuit is open.

Potential difference

The voltage across the terminals of the battery when the current is being drawn from it to an external circuit is called potential difference.

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