Voltmeter internal resistance

The internal resistance of an ideal voltmeter is infinity and the internal resistance of an ideal ammeter is zero.

1. What should be the internal resistance of a voltmeter?
2. Does a voltmeter have high or low internal resistance?
3. Why do voltmeters have internal resistance?
4. How does internal resistance affect voltmeter?

What should be the internal resistance of a voltmeter?

The internal resistance of the ideal voltmeter is infinity since it should not allow any current to flow through the voltmeter. Voltmeter measures the potential difference, it is connected in parallel.

Does a voltmeter have high or low internal resistance?

Hence, voltmeter have very high resistance, and an ammeter have low resistance for accurate measurement of potential difference and current should be used.

Why do voltmeters have internal resistance?

A voltmeter measures the voltage difference between the two different points (say, on different sides of a resistor), but it should not change the amount of current going through the element between these two points. So it should have very high resistance so mat it doesn't draw current through it.

How does internal resistance affect voltmeter?

A voltmeter with non-infinite internal resistance (i.e. a real one) always puts some additional load on the circuit and hence it will always affect the reading. Save this answer. Show activity on this post. Having an extremely high resistance in a voltmeter is crucial to measuring the voltage drop across a component.