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  4. A refrigerator consumes an average 35 W power to operate between temperature -10° C to 25° C. If there is no loss of energy then how much average heat per second does it transfer ?

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Q. A refrigerator consumes an average $35\,W$ power to operate between temperature $-10^{\circ} C$ to $25^{\circ} C$. If there is no loss of energy then how much average heat per second does it transfer ?

JEE MainJEE Main 2021Thermodynamics

Solution:

$\frac{ T _{ L }}{ T _{ H }- T _{ L }}= C . O . P .=\frac{\frac{ dH }{ dt }}{\frac{ dW }{ dt }}$
$\frac{263}{35} \times 35=\frac{ dH }{ dt }$
$\frac{ dH }{ dt }=263$ watts