Conceptual Physics: The High School Physics Program
9th Edition
ISBN: 9780133647495
Author: Paul G. Hewitt
Publisher: Prentice Hall
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Textbook Question
Chapter 24, Problem 43A
In buildings that are being heated electrically, is it wasteful to turn on all the lights? Is turning on all the lights wasteful if the building is being cooled by air conditioning? Defend your answers.
Expert Solution & Answer
To determine
To Explain: Whether the turning on the lights for heating up is wasteful or not when the building is heated up electrically and when cooled using the air conditioner.
Explanation of Solution
Introduction:
In electric bulbs, the electric energy is converted into the light as well as heat energy. The light is produced when filament gets heated up as current passes through it.
Energy is always wasted when lights are turned on. This is because most of the energy is dissipated as heat while the only a small amount is converted into light. A lightbulb is especially very inefficient source of light.
For the purpose of heating up, the lights would not be wasteful in case the building is being heated electrically. Turning on lights in order to heat up the room would be actually useful because majority of the electrical energy is dissipated as heat.
It would be wasteful to turn on the lights while the air conditioner is used because the air conditioner would have to do more work to further cool the room.
Chapter 24 Solutions
Conceptual Physics: The High School Physics Program
Ch. 24 - What is the meaning of the Greek words from which...Ch. 24 - Is the study of thermodynamics concerned primarily...Ch. 24 - What is the lowest possible temperature on the...Ch. 24 - What is the temperature of melting ice in kelvins?...Ch. 24 - How does the law of the conservation of energy...Ch. 24 - What happens to the internal energy of a system...Ch. 24 - Prob. 7ACh. 24 - Prob. 8ACh. 24 - Prob. 9ACh. 24 - What happens to the temperature of air when it is...
Ch. 24 - What generally happens to the temperature of...Ch. 24 - What generally happens to the temperature of...Ch. 24 - How does the second law of thermodynamics relate...Ch. 24 - What three processes occur in every heat engine?Ch. 24 - What is thermal pollution?Ch. 24 - If all friction could be removed from a heat...Ch. 24 - What is the ideal efficiency of a heat engine that...Ch. 24 - Why are heat engines intentionally run at high...Ch. 24 - Give at least two examples to distinguish between...Ch. 24 - How much of the electrical energy transformed by a...Ch. 24 - With respect to orderly and disorderly states,...Ch. 24 - What is the physicists term for a measure of...Ch. 24 - Under what condition can entropy decrease in a...Ch. 24 - What is the relationship between the second law of...Ch. 24 - Prob. 25ACh. 24 - Calculate the ideal efficiency of a heat engine...Ch. 24 - Calculate the ideal efficiency of a ships boiler...Ch. 24 - Calculate the ideal efficiency of a steam turbine...Ch. 24 - In a heat engine driven by ocean temperature...Ch. 24 - On which temperature scale does the average...Ch. 24 - Prob. 31ACh. 24 - Prob. 32ACh. 24 - Maria vigorously shakes a can of liquid back and...Ch. 24 - When you pump a tire with a bicycle pump, the...Ch. 24 - What happens to the gas pressure within a sealed...Ch. 24 - We know that warm air rises. So it might seem that...Ch. 24 - The combined molecular kinetic energies of...Ch. 24 - Prob. 38ACh. 24 - Prob. 39ACh. 24 - Will the efficiency of a car engine increase,...Ch. 24 - Consider the inverted soft drink can placed in a...Ch. 24 - A mixture of fuel and air is burned rapidly in a...Ch. 24 - In buildings that are being heated electrically,...Ch. 24 - Why is thermal pollution' a relative term?Ch. 24 - Is it possible to construct a heat engine that...Ch. 24 - What happens to the efficiency of a heat engine...Ch. 24 - Water put into a freezer compartment in your...Ch. 24 - Carlos says that perpetual motion machines are...Ch. 24 - Helium has the special property that its internal...Ch. 24 - Imagine a giant dry-cleaners bag full of air at a...Ch. 24 - What is the ideal efficiency of an automobile...Ch. 24 - Prob. 52ACh. 24 - Which heat engine has greater ideal efficiency,...Ch. 24 - To increase the efficiency of a heat engine, would...Ch. 24 - A heat engine takes in 100 kJ of energy from a...Ch. 24 - A certain heat engine takes in 25 kJ of heat and...Ch. 24 - During one cycle, an ideal heat engine exhausts...Ch. 24 - A heat engine operates between Thot=750C and...Ch. 24 - Prob. 59A
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