Four cells, each with an internal resistance of 0.40 ? and an e.m.f. of 2.5 V are connected in series to a load of 38.40 ?.
(a) Verify the current flowing in the circuit and the p.d. at the battery terminals.
(b) If the cells are connected in parallel instead of in series, verify the current flowing and the p.d. at the battery terminals.