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.

Prabhakar , 7 Years ago

Grade 10