A railway compartment is lit up by thirteen lamps each taking $2.1\, amp$ at $15\, volts$. The heat generated per second in each lamp will be ............ $cal$
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(c) The heat generated $= IVt$ $ = 2.1 \times 15 \times 1 = 31.5\,J$
$ = 31.5/4.2\,\,cal$$ = 7.5\,cal.$
$ = 31.5/4.2\,\,cal$$ = 7.5\,cal.$
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