Question

Explain the determination of the internal resistance of a cell using voltmeter​

Answer 1

Answer:

Determination of internal resistance:

Since the voltmeter draws very little current for deflection, the circuit may be considered as open. Hence, the voltmeter reading gives the emf of the cell. ... Due to internal resistance r of the cell, the voltmeter reads a value V, which is less than the emf of cell ξ.