This is Meyer's Equation
At constant volume as there is no work done on the gas(ΔV=0) all the heat supplied goes for the increase of internal energy. Hence temperature of body increases with less supply of heat. Whereas at constant pressure heat supplied accounts for both internal energy and work done on the gas.
if we increase temp. of 1 mole of gas by 1K or 1C then
This is also called Meyer's formula.
The performance of refrigerator is expressed by means of cofficient of performance
cofficient of performance = Heat extracted / work done =