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CBSE Class 10 Answered

Q. An electric Lamp is rated 220 V and 50 W. Find the power consumed when it is operated on 120 V.
Asked by Trisha Gupta | 10 Jun, 2021, 06:46: PM
answered-by-expert Expert Answer
Let us find out the resistance R of the bulb that has power rating 50W when it is operating in 220 V .
 
Power P = V2 / R  
 
where V is voltage and R is resitance 
 
Hence resistance R = V2 / P = ( 220 × 220 ) / 50 = 968 Ω
 
When this bulb is connected to 120 V , then  consumed power P is given as
 
P = ( 120 × 120 ) / 968 =  14.876 W
 

Answered by Thiyagarajan K | 10 Jun, 2021, 07:24: PM

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