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Five identical cells, each with e.m.f. 2 V and internal resistance 0.2 ohm, are joined in series and then connected to an external resistor of 4 ohm. What current flows through the external resistor?

1. 2 A
2. 0.2 A
3. 0.5 A
4. 1 A

Correct answer: 2 A

Solution

Series cells give total e.m.f. 10 V and total internal resistance 1 ohm; the current is total e.m.f. over total resistance.

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