•P36 During three hours one winter afternoon, when the outside temperature was was kept at 20°C (68°F) with the expenditure of 45 kWh (kilowatt-hours) of ele leakage in joules per second through the walls of the house to the environment (th
•P36 During three hours one winter afternoon, when the outside temperature was was kept at 20°C (68°F) with the expenditure of 45 kWh (kilowatt-hours) of ele leakage in joules per second through the walls of the house to the environment (th
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
Transcribed Image Text:•P36 During three hours one winter afternoon, when the outside temperature was 0°C (32°F), a house heated by electricity
was kept at 20°C (68°F) with the expenditure of 45 kWh (kilowatt·hours) of electric energy. What was the average energy
leakage in joules per second through the walls of the house to the environment (the outside air and ground)?
The rate at which energy is transferred between two systems is often proportional to their temperature difference. Assuming
this to hold in this case, if the house temperature had been kept at 25°C (77°F), how many kWh of electricity would have
been consumed?
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