Which one of the following statements is correct?

Options

A. Potentiometer is used to measure the current in a circuit.
B. Potentiometer is used to measure the internal resistance of a cell.
C. Potentiometer is used to measure the resistance of a circuit
D. Potentiometer is used to measure the potential difference across a resistor.

Answer

B

Explanation

Potentiometer is used to measure internal resistance of a cell, e.m.f. of a cell and to compare the e.m.f..s of