One electric bulb is rated 40W and 240V and other 25W and 240 V. Find the ratio of resistance of first bulb to that of second bulb.
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Answer:In the first bulb,p=v²/R
R=v²/p
R=240×240/40
R=1440ohms
In the second bulb,p=v²/R
R=v²/p
R=240×240/25
R=48×48
R=2304
NowR1/R2=1440/2304
Solve it to get the ratio.
Explanation:
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