For the measurement of potential difference,a | vedclass

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Question

(D) potentiometer works on the principle of the null deflection method.In the balanced condition,the potential difference across the cell is measured

Vedclass · Accepted Answer

a potentiometer does not draw any current from the circuit

Vedclass · Answer

(D) potentiometer works on the principle of the null deflection method.In the balanced condition,the potential difference across the cell is measured without drawing any current from the circuit.Since no current flows through the secondary circuit at the balance point,the potentiometer measures the true electromotive force $(EMF)$ or potential difference.In contrast,a voltmeter has a finite resistance and draws some current from the circuit,which leads to a voltage drop across the internal resistance of the source,resulting in an inaccurate reading.

For the measurement of potential difference,a potentiometer is preferred in comparison to a voltmeter because

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