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

Question

Accepted Answer

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) .

Step-by-Step Solution

Practice All PHYSICS Questions