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Three equal resistors connected across a source of e.m.f. together dissipate 10 watt of power. What will be the power dissipated in watts if the same resistors are connected in parallel across the same source of e.m.f.?

1. 10
2. 10/3
3. 30
4. 90

Correct answer: 90

Solution

When resistors are connected in series, the total resistance increases, and the power dissipated is lower. In parallel, the equivalent resistance decreases, leading to higher power dissipation. Since the power in series is 10 W, in parallel, it will be three times higher, i.e., 90 W.

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