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CBSE Class 10 Answered

an electric bulb is related220 V and 100 W when it is operated on 110 V the power consumed will be

 

Asked by kartik2811somvanshi | 22 Jun, 2021, 08:44: AM
Expert Answer
Resistance R and Power P are related as
 
P = V2 / R 
 
where V is voltage
 
Hence Power is directly proportional to square of voltage but resistance will remain constant.
 
Hence when voltage is halved , power is reduced by a factor (1/4)
 
Hence power consumed by the bulb at 110 V is (100/4) = 25 W
 
Answered by Thiyagarajan K | 22 Jun, 2021, 09:26: AM
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