•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

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter17: Energy In Thermal Processes: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 64P

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Concept explainers

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.

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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?

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