Question |
Answer |
What is energy? |
The capacity to do work OR transfer heat |
What are the two major types of energy? |
Kinetic and potential |
Moving matter has kinetic energy because… |
It has mass and velocity |
Wind, flowing water, and electricity are examples of which type of energy? |
Kinetic |
Heat is… |
The total kinetic energy of all moving atoms, ions, or molecules in a given substance |
Heat flows from warm to… |
Cool |
What are the three methods that heat can be transferred? |
Radiation, conduction, and convection |
Electromagnetic radiation occurs when… |
There are changes in electric and magnetic fields |
Different forms of electromagnetic radiation have different |
Wavelengths and energy content |
Gamma rays, x-rays, and UV radiation have |
Short wavelengths and high energy content |
Visible light and infrared have |
Long wavelengths and low energy content |
Which type of electromagnetic radiation makes up most of the spectrum emitted by the sun? |
Visible light |
An unlit match, rock held in your hand, chemical energy stored in gasoline molecules, and nuclear energy in the nuclei of atoms are examples of… |
Potential energy |
What is an example of potential energy changing to kinetic energy? |
Ex: potential energy in molecules of carbohydrates you eat change to kinetic when your body uses it to move |
High temperature heat, nuclear fission, concentrated sunlight, high-velocity wind, and energy released from burning natural gas, gasoline, or coal, are examples of high quality or low quality energy? |
High quality |
Heat dispersed in the atmosphere or ocean is an example of high quality or low quality energy? |
Low quality |
Thermodynamics is the study of… |
Energy transformations |
The first law of thermodynamics tells us that |
Energy cannot be created or destroyed; energy input=output |
Energy consumption means |
Converting energy from one form to another |
If you fill a car’s tank with gasoline and drive around or use a flash- light battery until it is dead, you lose |
Energy quality |
The second law of thermodynamics tells us that |
When energy changes from one form to another, we always end up with lower-quality or less usable energy than we started with |
As a result of energy losing quality as it is converted… |
We can never recycle or reuse high-quality energy to perform useful work |
Energy efficiency is |
a measure of how much useful work is accomplished by a particular input of energy into a system |