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(C) The heat generated per second is equivalent to the power consumed by the lamp.The power $P$ is given by the formula $P = V 	imes I$.Given: Voltag

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$7.5$

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(C) The heat generated per second is equivalent to the power consumed by the lamp.The power $P$ is given by the formula $P = V 	imes I$.Given: Voltage $V = 15\,V$ and Current $I = 2.1\,A$.$P = 15\,V 	imes 2.1\,A = 31.5\,W$ (or $31.5\,J/s$).To convert the heat generated in Joules to calories,we use the conversion factor $1\,cal = 4.2\,J$.Heat in calories per second $= \frac{31.5\,J}{4.2\,J/cal} = 7.5\,cal/s$.Therefore,the heat generated per second in each lamp is $7.5\,cal$.

$A$ railway compartment is lit up by thirteen lamps,each taking $2.1\,A$ at $15\,V$. The heat generated per second in each lamp will be ............ $cal$.

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