Question

Why is the e.m.f of a cell usually greater than the p.d of the terminal when the cell is used to supply current to an external circuit

Answer 1

Answer:

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Explanation:

EMF is the potential difference across the two terminals of a voltage source when it is not connected to any circuit. Once it is connected to a circuit, the voltage reduces slightly because of the internal resistance of the voltage source. The terminal voltage of the voltage source is the potential difference across the terminals when it is connected to a circuit.