Question: A house is maintained at 21C in winter by electric resistance heaters. If the outdoor temperature is 9C, the second-law efficiency of the resistance heaters

A house is maintained at 21°C in winter by electric resistance heaters. If the outdoor temperature is 9°C, the second-law efficiency of the resistance heaters is
(a) 0%
(b) 4.1%
(c) 5.7%
(d) 25%
(e) 100%

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