Twelve cells, each of e.m.f. 1.5V and internal resistance 0.225Ω, are arranged four in series per row or bank, with three banks in parallel. The battery so formed is connected to a load consisting of a series-parallel resistor arrangement, made up of a 2Ω resistor connected in parallel with a 3Ω resistor, these in turn being connected in series with a 2.5Ω resistor. Find the battery terminal voltage, the power ratings of the resistors and the energy converted into heat in the complete circuit if the arrangement is switched on for 1 hour.



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