Refrigerator Questions

A refrigerator works between $4^{\circ }\text{C}$ and $30^{\circ }\text{C}$. It is required to remove $600\text{calories}$ of heat every second in order to keep the temperature of the refrigerated space constant. The power required is: (Take $1\text{cal}=4.2\text{Joules}$)

The temperature inside a refrigerator is $t_2^{\circ }\text{C}$ and the room temperature is $t_1^{\circ }\text{C}$. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be: