Question
What is the difference between EMF and Cell potential (potential difference)?

Answer

S. No.EMFCell Potential (Potential difference)
1.EMF is the potential difference between two electrodes when no current is flowing in the circuit.Cell potential measures the difference in the potentials of the two half-cells when electric current flows through the cell.
2.EMF is the maximum voltage which can be obtained from the cell.Cell potential is always less than the maximum voltage obtainable from the cell.
3.EMF corresponds to the maximum useful work obtained from the galvanic cell.Cell potential does not correspond to the maximum useful work.
4.EMF is measured by potentiometerCell potential is measured by using a voltmeter.

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