| A | B |
|---|
| energy | the ability to do work or cause change |
| kinetic energy | the energy of motion |
| nonrenewable resources | natural resources such as petroleum, minerals, and metals that are used up faster than they can be replaced |
| potential energy | energy that is stored and held in readiness |
| chemical reaction | process that produces chemical change, resulting in new substances that have properties different from those of the original substances |
| alternating current | electric current that changes its direction many times each second |
| mechanical energy | energy associated with the motion or position of an object |
| radiant energy | energy carried by an electromagnetic wave |
| electromagnet | a magnet created by wrapping a current carrying wire around an iron core |
| nuclear energy | the potential energy stored in the nucleus of an atom |
| nuclear fission | nuclear reaction that occurs when the nucleus splits |
| nuclear fusion | nuclear reaction that occurs when nuclei fuse or join together |
| vacuum | empty space, doesn't even contain air |
| endothermic reaction | chemical reaction that absorbs energy |
| friction | force that acts against motion of two touching surfaces and always slows object down |
| exothermic reaction | a chemical reaction that releases heat energy |
| photovoltic cell | converts solar energy to electric energy |
| generator | a device that converts mechanical energy to electrical energy |
