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NEET PHYSICSEasy

The net resistance of a voltmeter should be large to ensure that:

A

It does not get overheated

B

It draws excessive current

C

It can measure large potential difference

D

It does not appreciably change the potential difference to be measured

Step-by-Step Solution

  1. Connection Principle: A voltmeter is connected in parallel to the component across which the potential difference is to be measured .
  2. Avoiding Circuit Disturbance: If the voltmeter has a low resistance, it will draw a significant current from the main circuit. This current draw acts as a shunt, lowering the equivalent resistance of the parallel combination and reducing the potential difference across the component, thereby disturbing the original circuit conditions .
  3. Ideal Condition: To measure the potential difference accurately without altering it, the voltmeter must draw negligible current. This is achieved by ensuring the net resistance of the voltmeter is very large (ideally infinite) .
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