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NEET 2003 (AIPMT) · Electrical Power & Heating Effect

Electrical Power & Heating Effect question from NEET 2003 (AIPMT)

Q81NEET 2003 · AIPMTEasy

Electrical Power & Heating Effect

Two 220 volt, 100 watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220 volt a.c. supply line. The power drawn by the combination in each case respectively will be

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Answer: (d)

Each bulb: $R = \frac{220^2}{100} = 484\ \Omega$ .
Series: $P = \frac{220^2}{968} = 50\ \text{W}$ .
Parallel: each bulb gets 220 V and draws 100 W, total $200\ \text{W}$ .
So the answer is (d) 50 watt, 200 watt.

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