1.

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.            \[\frac{Rt}{4.2\,{{I}^{2}}}cal\]
Answer» B.            \[\frac{{{I}^{2}}t}{4.2R}cal\]


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