Question

Hundred kilo joules of energy flows in one minute forty seconds in an electric device of resistance forty ohms calculate the potential difference at the end of the device

Answer 1

Energy = (V²/R)t

therefore,

100000 = (V²/40)×40

=> V² = 100000
=> V = √100000 = 100√10 volts

Answer 2

Energy =(v²/R) t

100000= (v²/40)40

v²=10000

v = √100000

v=100√10