Two batteries A and B are connected in parallel (positive to positive) with each other and this combination is connected in parallel with a battery C; this is in series with a 25 Ω resistor, the negative terminal of C being connected to the positive terminals of A and B. Battery A has an emf of 108 V and internal resistance 3 Ω , and the corresponding values for B are 120 V and 2 Ω . Battery C has an emf of 30 V and negligible internal resistance. Sketch the circuit and calculate
(a) the value and direction of current in each battery and
(b) the terminal p.d. of A.