| Bearsharktopus | |
| the measure of how much work we can get from each unit of energy we use | |
| involves using a combined heat and power system | |
| system when two useful forms of energy are produced from the same fuel source | |
| this provides houses and other buildings with the heat they need | |
| captures energy from the sun by pumping a heat absorbing fluid placed on the roof of a house | |
| this is also known as solar cells | |
| thin wafers of purified silicon or polycrystalline silicon with trace amounts of metal allowing electricity to be produced | |
| heat stored in soil, underground rocks, and fluids in the earth's mantle | |
| using wind to produce electricity is an important step toward this | |
| can produce electricity and it gets its energy from wind | |