Q.

A boy has two electric bulbs. One is marked 240V and 100W and the other is marked 240V and 60W. He tries to decide which of the following assertions are correct. 

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a

The 60W bulb has less resistance and so burns less brightly

b

The 60W bulb has more resistance and so burns less brightly

c

The 100W bulb has more resistance and so burns more brightly

d

The 100W bulb has less resistance and so burns less brightly 

answer is A.

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Detailed Solution

P=V2R Hence R=V2P.

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A boy has two electric bulbs. One is marked 240V and 100W and the other is marked 240V and 60W. He tries to decide which of the following assertions are correct.