| A | B |
|---|
| energy transformation | a force that opposes motion between two surfaces |
| heat efficiency | the efficiency rating of an object to keep in heat. It is expressed as a percent. |
| insulation | a material that resists the movement of heat through it. |
| kilowatt | 1000 watts |
| kilowatt-hour | the kilowatt an appliance will use in 1 hour. |
| non-renewable energy sources | limited and can not be easily replaced. Examples include coal, oil and natural gas. |
| renewable energy sources | energy sources that can be replaced. |
| Scientific model | a process followed in science to arrive at answer to a specific problem |
| Chemical energy | the energy produced by chemical reactions |
| Electrical energy | the energy we use to make parts in our machines move |
| Elastic energy | the energy an object has when its shape is changed by stretching (pulling apart) or compressing (pushing together) |
| Nuclear energy | the energy stored deep inside matter |
