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CBSE Class 10 Answered

A BULB IS RATED 220V-100W , NOW WHAT WILL BE IT'S POWER WHEN CONNECTED TO 110V?
Asked by | 10 May, 2008, 05:11: PM
answered-by-expert Expert Answer

 

Here  V = 220V ,  P = 100W

We know that      P = V2/R

So                         R = V2 /P

                                 = (220 x 220) / 100

                                =  484 ohm

Now when V = 110V,            R = 484ohm

            P = V2/R = (110 x 110 )/ 484 = 25 W.

regards

toppersexpert

 

 

Answered by | 26 May, 2008, 01:51: AM

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