Question

According to the joules law of heating H=I*2Rt in which H is directly proportional to resistance, we know that according to ohm law I=V/R putting this in joules law we get H=v*2/R*2 *t in which heat is directly proportional to resistance. So how that possible that heat is both directly or inversely proportional to resistance. Or if not possible so heat is directly proportional or inversely proportional to resistance???

Answer 1

Case 1 -----> H = I ²RT

Case 2 ------> H = V²/R*T

Here the matter is not of resistance bcoz the value of resistance changes as current nd potential difference changes .

In case 1) It is matter of current so resistance is directly proportional and in case 2) matter is of potential difference, so it is inversely proportional.