A 100 w 250 v is operated on 125v supply then the power consumed is
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P = (v)2/r
100 = (250)2/r
100 = 62500/r
r = 62500/100
r = 625
r is resistance taken constant
Then,
P = (125)2/625
P = 125×125/625
P = 125/5
P = 25W
100 = (250)2/r
100 = 62500/r
r = 62500/100
r = 625
r is resistance taken constant
Then,
P = (125)2/625
P = 125×125/625
P = 125/5
P = 25W
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