question_answer

The heat developed in an electric wire of resistance R by a current I for a time t is             [MP PMT 1993; MP PET 2005]

A)            \[\frac{{{I}^{2}}Rt}{4.2}cal\]  

B)            \[\frac{{{I}^{2}}t}{4.2R}cal\]

C)            \[\frac{{{I}^{2}}R}{4.2\,t}cal\]                                           

D)            \[\frac{Rt}{4.2\,{{I}^{2}}}cal\]