| Term | Definition |
|---|
| energy efficiency | measure of energy produced to energy consumed |
| Hybrid vehicle | vehicle that runs half on electricity and half on gas |
| net energy yield | Ratio of useful energy produced to energy used in production |
| cogeneration | Production of two kinds of energy at the same plant at the same time |
| passive heat absorption | Directly catching the sun for warmth, as in greenhouses |
| active solar system | A system that collects solar energy by letting the sun passively warm a fluid |
| photovoltaic cells | technology that converts solar energy directly to electricity |
| flywheel | A type of energy storage that spins fast, full of mechanical energy |
| fuel cell | A type of energy storage that separates the electrons from the protons in Hydrogen and produces a current |
| biofuel | Gasoline mixed with ethanol |
| low-head hydropower | Hydropower from smaller, less invasive dams |
| run-of-the-river flow | Natural river flow, not dammed |
| geothermal energy | Energy from the heat inside the earth. Lasts long and wastes little, but might produce dangerous gases. |
| tidal station | A power generator that gets energy from the tide. Not very good for the environment. |
| ocean thermal electric conversion | The sun evaporates a liquid, and the steam powers a turbine |
Combine with other sets
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