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

Temperature inside refrigerator t20C Room temperature t10CFor refrigerator, Heat given to high temperature Q1 Heat taken from lower temperature Q2=T1T2Q1Q2=t1+273t2+273⇒Q1Q1-W=t1+273t2+273 or, 1-WQ1=t2+273t1+273 or WQ1=t1-t2t1+273The amount of heat delivered to the room for each joule of electrical energy (W=1 J)Q1=t1+273t1-t2