Question

An ideal voltmeter should have
1. zero resistance
2. low resistance
3. infinite resistance
4. moderate resistance

Answer 1

Correct Answer - Option 3 : infinite resistance

CONCEPT:

• Voltmeter: The device that is used to measure the electrical potential difference between two points in an electric circuit is called a voltmeter.
  • The voltmeter is connected in parallel with the circuit to measure the same voltage drop that occurs across it.
  • An ideal voltmeter allows all the current to pass through the circuit without any hindrance.

EXPLANATION:

• An ideal voltmeter allows all the current to pass through the circuit without any hindrance. So that reading of voltage has no error. As V =IR
• This is possible only when there is no current pass through the voltmeter in the parallel circuit.
• There is no current pass through the voltmeter only when it has infinite resistance.
• So an ideal voltmeter should have infinite resistance.