sources of energy -...
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Sources of
Energy
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Forms of Energy
• All forms of energy are related.
• Each form can be converted into any other form.
• You can not create or destroy energy, only change its form.
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Classifications of Energy Sources
Limited
Petroleum
Coal
Natural gas
Uranium
Unlimited Solar
Wind
Gravitational
Tidal
Geothermal
Fusion
Renewable
Biomass
Animal Power
Human Muscle Power
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Energy Sources
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Nuclear Power
• Generated by fission of uranium, a metal that is mined
• Produces around 11% of the world's energy needs
• Produces huge amounts of energy from small amounts of fuel
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U.S. Nuclear Reactor Locations
http://crasstalk.com/2011/03/where-are-all-the-nuclear-power-plants-in-the-us/
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World Nuclear Reactor Locations
http://incontiguousbrick.wordpress.com/2007/08/21/nuclear-reactors-of-the-world/
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Biomass • Organic (once-living) matter such as wood,
crops, landfill gas, manure, alcohol fuels, garbage
• Burned directly or converted into flammable liquids/gases.
(corn ethanol + gas = gasohol)
• Biofuels provide about 3% of our energy in the United States.
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Geothermal Power
• Comes from heat trapped deep within the earth.
• Natural steam geysers are used to generate electricity.
• Hot water can also be pumped out of the ground to heat buildings.
• Geothermal sources account for less than 1% of the total energy produced in the United States.
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Hydropower • Moving water holds a tremendous amount of potential
energy.
• Dams are built to direct failing water through a turbine to generate electricity.
• About 3% of our total energy in the United States comes from waterpower.
Free flow underwater turbine (no dam)
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Solar Power • The sun's energy can be used to directly heat
buildings or to provide hot water. It can also be converted to electricity.
• Photovoltaic devices (often called "solar cells") can produce only small amounts of electricity.
• Provides less than 1% of our energy.
1911 – Solar water heater
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Photovoltaic Cells 1. Sunlight strikes the solar
cell
2. Electrons are knocked loose
3. Electrons move toward the treated front surface creating an electron imbalance
4. A wire connecting the 2 surfaces conducts the electrical current between the + and - sides
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Wind Power
• Windmills can pump water or grind flour, and generate electricity.
• Less than 1 % of our energy is now being produced by wind power.
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