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Question

Two incadesecent light bulbs of 40W and 60 W rating are connected in series across the mains Then

A
the bulb together consume 100W
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B
the bulb together consume 50 W
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C
the 60 W bulb glows brighter
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D
the 40 W bulb glows brighter
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Solution

The correct option is D the 40 W bulb glows brighter∵P ∝ 1R Therefore, resistance of 40W bulb > resistance of 60W bulb. For series connection, current through both the bulbs will be same P=I2R (for series connection) Power consumed by 40W bulb > power consumed by 60 W bulb. Hence, The 40 W bulb glows brighter.

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