Current Electricity

A cell of emf E and internal resistance r is connected to two external resistances \(\mathrm{R_1}\) and \(\mathrm{R_2}\) and a perfect ammeter. The current in the circuit is measured in four different situations:

(a) without any external resistance in the circuit.

(b) with resistance \(\mathrm{R_1}\) only

(c) with \(\mathrm{R_1}\) and \(\mathrm{R_2}\) in series combination.

(d) with \(\mathrm{R_1}\) and \(\mathrm{R_2}\) in parallel combination.

The currents measured in the four cases in ascending order are