Question

Example 23. A galvanometer, together with an unknown resistance in series, is
connected across two identical batteries each of 1.5 V. When the batteries are connected in
series, the galvanometer records a current of 1 A and when the batteries are connected in
parallel, the current is 0.6 A. What is the internal resistance of the battery?
(I.I.T. 1973)​

Answer 1

Answer:

A galvanometer, together with an unknown resistance in series, is connected across two identical batteries of each 1. ... When the batteries are connected in series, the galvanometer records a current of 1 A, and when the batteries are connected in parallel, the current is 0. 6 A , then the internal resistance is 1/x′ Ω.