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Distinguish between a potentiometer and a voltmeter.

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Potentiometer Voltmeter
1. A potentiometer is used to determine the emf of a cell, potential difference and internal resistance. 1. A voltmeter can be used to measure the potential difference and terminal voltage of a cell. But it cannot be used to measure the emf of a cell.
2. Its accuracy and sensitivity are very high. 2. Its accuracy and sensitivity are less as compared to a potentiometer.
3. It is not a portable instrument. 3. It is a portable instrument.
4. It does not give a direct reading. 4. It gives a direct reading.

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