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Potentiometer measures the potential dif...

Potentiometer measures the potential difference more accurately than a voltmeter, because

A

it has a wire of high resistance

B

it has a wire of low resistance

C

it does not draw current from external circuit

D

it draws a heavy current from external circuit

Text Solution

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The correct Answer is:
C
When we measure the emf of a cell by the potentiometer then no current flows in the circuit in zero-deflection condition ie, cell is in open circuit. Thus, in this condition the actual value of a cell is found. In this way, potentiometer is equivalent to an ideal voltmeter of infinite resistance.
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