Question

Potentiometer is an ideal voltmeter because:

• A. It has zero resistance
• B. It can measure infinite voltage.
• C. It can take infinite current from the circuit.
• D. It draws zero current from the circuit.

Answer 1

The correct option is D It draws zero current from the circuit.

When a potentiometer is in balanced condition, it draws zero current from the circuit. The slider arm contains a galvanometer for this purpose. When the current through the arm in both directions is exactly zero, the potentiometer is balanced. (We can’t use an ammeter instead of a galvanometer here. Why?)Now, when no current is drawn from the circuit when potential is measured.