Thrity cells each having an e.m.f, of 2.2V and an internal resistance of 0.3Ω are so connected to give a supply e.m.f of 22V. If the arrangement is then connected to three 20V, 10W lamps in parallel, calculate (a) the terminal voltage of the battery, (b) the current taken by each lamp, (c) the power wasted in each cell.

Thrity cells each having an e.m.f, of 2.2V and an internal resistance of 0.3Ω are so connected to give a supply e.m.f of 22V. If the arrangement is then connected to three 20V, 10W lamps in parallel, calculate (a) the terminal voltage of the battery, (b) the current taken by each lamp, (c) the power wasted in each cell.