Power Consumed By Bulb

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A 100W-220V bulb is connected to 110V Source. Calculate the power consumed by the bulb.


The answer is 25.

Subbbarao Mantripragada by Subbbarao Mantripragada , 26, India

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1 solution

P=100W, V=220v

Resistance (R)=V^2/P=(220*220)/100=484Ohms

Actual Operating Voltage V'=110v

So, Power Consumed by bulb ,(P')=V'^2/R=(110*110)/484=25Watts

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Clarity aa ????

Subbbarao Mantripragada - 7 years, 4 months ago

Normally power consumption is in units,question was not clear,however solution given by Mr Subbarao is correct .Thanks.

K.K.GARG,India

Krishna Garg - 6 years, 11 months ago

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