How much will be the power of a 220V, 100W electric bulb working at 110V ? (a) 100W, (b) 75W, (c) 50W, (d) 25W.
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Explanation:
Input power = ( working voltage)²/R
= ( 220 x 220 )/ R
R = 48400/ 100 = 484 ohm
now ,
power =( 110 x110)/ 484 = (110 x 110 )/ (22 x 22)
= 100/4 = 25W
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Hey there !
Your answer is : 25 W
• Please refer to the attachment below for step by step explanation!
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