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(a) State what is meant by electromotive force (e.m.f.) force of battery (b) The graph in figure 5 shows how the terminal voltage, V, of a certain battery varies with the current, I, being drawn from the battery.
(i) Sketch the circuit that could be used
to obtain the plotted results.
(ii) Write an expression relating the e.m.f., E, terminal voltage, V, current, I and the internal resistance, r, of the battery for the circuit drawn in (i) above.
(iii) From the graph, determine the: (I) Internal resistance, r, of the battery. (II) E.m.f., E, of the battery.