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NEET 1998 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 1998 (AIPMT)

Q93NEET 1998 · AIPMTEasy

Electrical Power & Heating Effect

Three equal resistors connected in series across a source of emf together dissipate $10$ watt of power. What will be the power dissipated in watt if the same resistors are connected in parallel across the same source of emf?

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Answer: (d)

Series: $R_s = 3R$ , $P_s = \frac{V^2}{3R} = 10\ \text{W}$ .
Parallel: $R_p = \frac{R}{3}$ , $P_p = \frac{3V^2}{R} = 9 P_s$ .
$P_p = 9 \times 10 = 90\ \text{W}$ .
So the answer is (d) 90.

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