Question

An ideal ammeter and an ideal voltmeter have resistances of  ………… \(\Omega\) and ……

Hint:

An {ideal ammeter} has {zero resistance} so that it does not affect the current in a circuit. An {ideal voltmeter} has {infinite resistance} so that it does not draw any current from the circuit.

Answer 1

Step 1: Understanding the Resistance of an Ideal Ammeter 
- An ammeter measures current and is connected in series with a circuit.
- For an ideal ammeter:
- It should not affect the current.
- It must have zero resistance (\( 0 \, \Omega \)) so that it does not cause a voltage drop. 
Step 2: Understanding the Resistance of an Ideal Voltmeter 
- A voltmeter measures voltage and is connected in parallel with a circuit.
- For an ideal voltmeter:
- It should not draw any current from the circuit.
- It must have infinite resistance (\( \infty \, \Omega \)) so that it does not disturb the circuit. Thus, the resistances of an ideal ammeter and voltmeter are \( 0 \, \Omega \) and \( \infty \, \Omega \) respectively.