Question

out of 60W and 40W lamps which one has a higher resistance when in use​

Answer 1

Answer:

40w will be ur answer..

Explanation:

As we know that power is inversely proportional to the resistance. Justify by using the formula P=V²/R

hence, 40w will be ur answer..

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Answer 2

Answer:

Hey mate here's your answer.

Explanation:

I think that you have missed giving the value of potential difference.

Anyway i have seen a question like this in which the value of potential difference 220 V .So I'm taking potential difference as 220 V.

Therefore V=220V

P(power of lamp 1)=60W

P'(power of lamp 2)=40W

R(resistance of lamp 1)=V²/P

R=2420/3 ohm

R=806.667 ohm

R'(resistance of lamp 2)=V²/P'

R=1210 ohm

Therefore the lamp 2 has higher resistance.

If you have a different potential difference, put the value of it in place of 220 V and you will get your answer.

Hope it helps you.

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