Renewable & Nonrenewable Energy

4. The production of two useful forms of energy from the same fuel source.
8. Energy sources that are still in development. For it to be viable it must prove to be cost effective and have acceptable environmental impacts.
12. This uses the temperature difference in surface and deep ocean waters in the tropics to generate electricity.
13. A long loop of piping that circulates fluid underground to warm and cool homes. In summer it cools a home and in winter it warms a home.
14. A mixture of gasoline and ethanol which produces less air pollution than fossil fuels.
18. Electricity is produced chemically by combining hydrogen fuel with oxygen from the air.
19. A device used to initiate and control a sustained nuclear chain reaction. Surrounded by thick pressure vessel that is filled with a cooling liquid. The pressure vessel contains any products in case of an accident.
20. Uses sun's energy to heat something directly.
21. Plant material, manure, and any other organic matter that is used as an energy source.
22. Oil that is pumped from the ground, or crude oil.
23. A wheel that changes the force of a moving gas or liquid into energy that can do work.

1. Electricity produced in a small stream without having to build a big dam. This uses instruments such as floating turbines.
2. Energy that comes from sources that will eventually run out, or will not be replenished in our lifetimes.
3. Energy from sources that are constantly being formed.
5. Saving energy by using energy-efficient devices, wasting less energy, etc.
6. Tidal movement from oceans are used to generate electricity much like a hydroelectric dam. High tides trap water behind a dam, and when the water is released during low tide it turns a turbine producing electricity.
7. The movement of wind is converted into electrical energy, and it the fastest growing source of of energy in the world
9. Energy produced from moving water, a renewable energy resource that accounts for 20% of the earth's electricity.
10. The percentage of energy put into a system that does useful work.
11. Solar cells that convert the sun's energy into electricity.
15. Energy from the sun that is gathered by collectors and used to heat water or to heat a building.
16. Energy from the heat in the earth's crust is used to generate electricity.
17. A machine that converts mechanical energy, or motion, into electrical energy.
18. A natural resource that comes from the remains of ancient organisms that changed into coal, oil, or natural gas.
19. The energy within the nucleus of an atom, which fuels nuclear power plants.