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Q.

A refrigerator transfer 180 joule of energy in one second from temperature - 3oC to 27oC. Calculate the average power consumed, assuming no energy losses in the process.

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a

18 W

b

54 W

c

20 W

d

120 W

answer is C.

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Detailed Solution

Here, T1=27+273=300 K and T2=-3+273=270 K As Q1Q2=T1T2⇒Q1=T1T2×Q2=300270180=200 WTherefore,average power consumed =Q1-Q2=200W-180W=20 W

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A refrigerator transfer 180 joule of energy in one second from temperature - 3oC to 27oC. Calculate the average power consumed, assuming no energy losses in the process.