Question

Two identical batteries each of e.m.f. 2 V and internal resistance 1 W are available to produce heat in an external resistance by passing a current through it. The maximum power that can be developed across R using these batteries is(a) 3.2 W(b) 2.0 W(c) 1.28 W(d) 8/9 W

Answer 1

For maximum current the two batteries should be connected in series. The current will be maximum when external resistance is equal to the total internal resistance of cells i.e. 2 Ω . Hence power developed across the resistance R will be

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