HC Verma Part-II Chapter -32 Exercise Questions 16 - 19

16. Figure (32.E2) shows an arrangement to measure the emf ϵ
and internal resistance r of a battery. The voltmeter has a very high resistance and the ammeter also has some resistance. The voltmeter reads 1.52 V when the switch S is open. When the switch is closed the voltmeter reading drops to 1.45 V and the ammeter reads 1.0 A. Find the emf and the internal resistance of the battery.