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A water heater is marked 1500W, 220V. If the voltage drops to 180V,calculate the power consumed by the heater.
P1=V1I, 1500=220*I Hence I=150/22..............................(1)
P2= V2i P2=180*150/22 from (1)
Hence P2 =1227.27 W
(or)
P1=V1I, P1=V12/R..................(1)
P2=V2I,P2=V22/R....................(2)
P1/P2=V12 / V22
P2=P1*V22/V12
P2=1500*(180)2/(220)2
P2=1004.13W
WHICH OF THE ABOVE METHODS ARE CORRECT AND WHY?? CAN U PLEASE EXPLAIN???
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