The temperature inside a refrigerator is t20Cand the room temperature is t10C. The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be

For a refrigerator, we know that Q1W=Q1Q1−Q2=T1T1−T2where,Q1=amount of heat delivered to the roomW=electrical energy consumedT1=room temperature =t1+273T2=temperature of sink =t2+273∴Q11=t1+273t1+273−(t2+273)⇒Q1=t1+273t1−t2