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7Sci CH13

7th Science CH13 Energy Resources

fossil fuel coal, natural gas, and oil formed millions of years ago from the remains of once-living organisms; contains chemical potential energy and when burned produces thermal energy; fossil fuels are nonrenewable natural resources
generator any machine that can convert kinetic energy to electrical energy
hydroelectric power plant that uses water power to generate electricity; hydroelectric energy is a clean,plentiful, renewable alternative to fossil fuels but ecosystems may be destroyed in power plant construction
nonrenewable resource any natural resource that people use up more quickly than it can be replaced by natural processes, or may never be replaced, or can be replaced only over a very long period of time
renewable resource any natural resource that can be replaced by natural processes in less than a century; examples are trees and crops
solar cell converts sunlight into electricity; solar energy is clean, efficient, and renewable; however, solar energy is only available when there is sunlight, and solar cells are expensive to manufacture