Question

An electric bulb is rated 240 V & 60 W. When it is operated on 100 V,the power consumed will be.​

Answer 1

Explanation:

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Answer 2

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P = V²/R

If V = 240 V we have

60 W = 240²/R

R = 240²/60 ohm

R = 960 ohm

This is the resistance of the bulb

When V = 100 V

Power consumed = V²/R

= 100²/960 W

= 10.416 W

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