| A | B |
|---|
| energy | the ability to do work |
| kinetic energy | the energy of motion |
| potential energy | energy that is stored as a result of position or shape |
| gravitational potential energy | potential energy that depends upon an object's height |
| elastic potential energy | the potential energy of an object that is stretched or compressed |
| mechanical energy | the energy associated with the motion and position of everyday objects |
| thermal energy | the total potential and kinetic energy of all the microscopic particles in an object |
| chemical energy | the energy stored in the chemical bonds in compounds |
| electrical energy | the energy associated with electric charges |
| electromagnetic energy | a form of energy that travels through space in the form of waves |
| nuclear energy | energy stored in atomic nuclei |
| energy conversion | the process of changing energy from one form to another |
| nonrenewable energy resources | energy resources that exist in limited quantities and , once used, cannot be replaced except over the course of millions of years |
| fossil fuels | oil, natural gas and coal |
| renewable energy resources | resources that can be replaced in a relatively short period of time |
| hydroelectric energy | energy obtained from flowing water |
| solar energy | sunlight that is converted into usable energy |
| geothermal energy | the heat beneath Earth's surface |
| biomass energy | the chemical energy stored in living things |
| hydrogen fuel cell | generates electricity by reacting hydrogen with oxygen |
| energy conservation | finding ways to use less energy or to use energy more efficiently |
