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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



Question ID - 151391 | SaraNextGen Top Answer

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

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

When we measure the emf of a cell by the potentiometer then no current flows in the circuit in zero-deflection condition , 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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