Questions
The temperature inside a refrigerator is and the room temperature is . The amount of heat delivered to the room for each joule of electrical energy consumed ideally will be
detailed solution
Correct option is B
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-t2Talk to our academic expert!
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An electrical refrigerator abstracts 2000 calories from ice trays. The coefficient of performance is 4. Then the work done by motor in calories is
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