The temperature inside a refrigerator is t_2^@C and the room temperature is t_1^@C. The amount of heat delivered to the room for each joule of electrical energy consume ideally will be _____

The temperature inside a refrigerator is t_2^@C and the room temperatu

1.	The temperature inside a refrigerator is t_2^@C and the room temperature is t_1^@C. The amount of heat delivered to the room for each joule of electrical energy consume ideally will be _____
Answer» `(t_2+273)/(t_1-t_2)` `(t_1+t_2)/(t_2+273)` `(t_1)/(t_1-t_2)` `(t_1+273)/(t_1-t_2)` Solution :COEFFICIENT of PERFORMANCE of a refrigerator , `ALPHA =Q^2/W` Heat RELEASED in reservoir`Q_1=W+Q_2` `therefore Q_2=Q_1-W` `therefore alpha=(Q_1-W)/W=Q_1/W-1` `therefore Q_1/W=alpha+1` but `alpha=(t_2+273)/(t_1-t_2)` `therefore Q_1/W=(t_2+273)/(t_1-t_2)+1` `=(t_2+273+t_1-t_2)/(t_1-t_2)` `therefore Q_1/W=(t_1+273)/(t_1-t_2)`