12 Questions
What are the two types of energy?
The two types of energy are potential energy (stored energy) and kinetic energy (energy of motion).
What does the first law of thermodynamics state?
The first law of thermodynamics states that although energy cannot be created nor destroyed, it can be transformed from one form to another.
Provide two examples of energy transformations.
Examples of energy transformations include: 1) Sunlight being transformed into glucose bonds, and 2) Energy in gasoline being transformed into mechanical energy that powers pistons.
What does the first law say about the amount of energy in an isolated system?
The first law states that the amount of energy in an isolated system stays constant.
What does the second law of thermodynamics state?
The second law of thermodynamics states that as energy is transferred and transformed, more and more of it is wasted, and entropy (a measure of disorder) increases.
What source of energy provides the Earth with a continual input of energy?
Sunlight provides the Earth with a continual input of energy.
What is an example of heat flow?
Heat always transfers from hot body to cold body. For example, boiling water cools its surroundings.
In terms of energy conversions, what is another statement of the 2nd law of thermodynamics?
Energy conversions aren't perfect, as some energy is always lost as heat.
According to the 2nd law, what theoretical efficiency is never attained?
100% efficiency
If a coal-burning power plant can convert 1 ton of coal, containing 28,000 megajoules of chemical energy, into 7,000 MJ of electricity, what is the efficiency of the conversion?
0.25 or 25%
In terms of quality, heat is what type of energy? Because of this, heat cannot be used for what?
Heat is low-quality energy, and because of this, it cannot be used for work.
With every energy conversion, what form of energy is lost?
Usable energy
This quiz covers the basics of energy and the laws of thermodynamics. Learn about the types of energy, the first law of thermodynamics, and examples of energy transformations. Test your knowledge on how energy can be transformed from one form to another.
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