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NEET 1989 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 1989 (AIPMT)

Q102NEET 1989 · AIPMTMedium

Electrical Power & Heating Effect

40 electric bulbs are connected in series across a $220\text{ V}$ supply. After one bulb is fused the remaining 39 are connected again in series across the same supply. The illumination will be

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Answer: (b)

Total power in series: $P = \dfrac{V^2}{nR}$ .
With 39 bulbs the total resistance is smaller, so the power (illumination) is larger.
So the answer is (b) more with 39 bulbs than with 40.

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