Superiority of potentiometer over voltmeter?
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The terminal voltage of a cell is the potential difference between its electrodes. A voltmetercannot be used to measure the emf of a cell because a voltmeter draws some current from the cell. To measure a cell's emf a potentiometer is used since in a potentiometer measurement no current is flowing.
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A potentiometer is a versatile device. It can be used for various purposes unlike voletmeter which is only used to measure potential difference. A potentiometer measures the emf of a cell very accurately. It is based on null deflection method. While measuring it does not draw current from the source of unknown emf. Whereas a classical volmeter draws some current, so it measures potential approximately(not accurately). In other words a potentiometer measures the actual emf of cell wheareas a voltmeter measures its terminal potential difference. The sensitivity of potentiometer is also very high. It can measure potential differences much smaller than voltmeters.
Here is ur answer
A potentiometer is a versatile device. It can be used for various purposes unlike voletmeter which is only used to measure potential difference. A potentiometer measures the emf of a cell very accurately. It is based on null deflection method. While measuring it does not draw current from the source of unknown emf. Whereas a classical volmeter draws some current, so it measures potential approximately(not accurately). In other words a potentiometer measures the actual emf of cell wheareas a voltmeter measures its terminal potential difference. The sensitivity of potentiometer is also very high. It can measure potential differences much smaller than voltmeters.
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