Question

Potentiometer measures potential more accurately because

• A. it measures potential in open circuit.
• B. it uses sensitive galvanometer for null deflection.
• C. it uses high resistance potentiometer wire.
• D. it measures potential in closed circuit.

Answer 1

Answer: (A)

it measures potential in open circuit.

Potentiometer measures the emf of a cell when no current flows through its galvanometer, following the laws of wheatstone bridge. Since the circuit is open(no current in balanced state), the accuracy of the measurement is more as compared to the other methods.