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Two electric bulbs, one of 200 V, 40W and other of 200 V, 100W are connected in a domestic circuit. Then

1. they have equal resistance
2. the resistance of 40W bulb is more than 100W bulb
3. the resistance of 100W bulb is more than 40W bulb
4. they have equal current through them

Correct answer: the resistance of 40W bulb is more than 100W bulb

Solution

The power of a bulb is inversely proportional to its resistance for a given voltage (P = V²/R). Hence, the 40W bulb has a higher resistance than the 100W bulb.

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