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•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

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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•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?
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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