We use two expressions (i)H=I^2Rt (ii)H=V^2/Rt for calculating the energy consumed by a device. Out of these two expressions the first expression indicates that the energy consumed is directly proportional to R whereas the second expression indicates that the energy consumed is inversely proportional to R .How can we explain different dependence of H on R in these expressions.

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Arun · Answer

The expression P=I^2R holds when current I remain constant . The expression P=V^2/R holds when potential difference V remains constant . Both the expression for electric power are correct

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