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Sources Of Energy

Sources Of Energy . Chapter 5---Section 3. Energy Resources. Energy cannot be made or destroyed! The two main sources of energy are: The Sun Radioactive atoms in Earth’s interior. Nonrenewable Resources. Energy sources that are used up much faster than can be replaced Fossil fuels

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Sources Of Energy

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  1. Sources Of Energy Chapter 5---Section 3

  2. Energy Resources • Energy cannot be made or destroyed! • The two main sources of energy are: • The Sun • Radioactive atoms in Earth’s interior

  3. Nonrenewable Resources • Energy sources that are used up much faster than can be replaced • Fossil fuels • Nuclear energy • When Fossils Fuels burn: • Stored chemical energy is released • Releases pollutants into the air

  4. Fossil Fuels • Oil and Natural Gas: • Made from remains of microscopic marine organisms • Coal: • Formed from remains of ancient plants • All contain stored chemical energy that originated from the sun • All are formed by heat and pressure

  5. Nuclear Energy • Comes from the nuclei of unstable atoms • Ex. Uranium • Advantages- • Can be used to generate electricity instead of fossil fuels • Doesn’t cause air pollution • Disadvantages- • Uranium is nonrenewable • Waste produced is radioactive

  6. Hydroelectricity Using water to make electricity Water is a RENEWABLE resource - energy source that is replenished continually Advantage- pollution free Disadvantage- disrupts life cycles of aquatic organisms As long as there is precipitation to keep rivers flowing, energy can be produced

  7. Alternative Sources • Are less harmful to people and environment • Help to conserve fossil fuels • Most are INEXHAUSTIBLE resources -energy resources that can’t be used up • Include: • Solar Energy • Geothermal Energy • Energy From Oceans • Wind

  8. Solar Energy • Is really expensive • Collected by: • Thermal collectors • Use black pipes to collect sun’s rays • Photovoltaic collectors • Photo means light / voltaic means electrical • Transform light energy directly into electrical energy

  9. Geothermal Energy • Generated from heat deep inside Earth: • Radioactive decay • Molten rock or magma • Hot springs or geysers

  10. Electrical Energy From Oceans • Oceans are always in motion • Inexhaustible source of mechanical energy • Does not produce pollution • Tidal power plants: • Generate electricity as the tide comes in or goes out • Limited usage

  11. Wind Energy • Windmills • Convert kinetic energy into electrical energy • Propeller is the turbine which is connected to generator • Advantage • Does not produce pollution • Disadvantage • Produce noise • May kill birds

  12. Conserving Energy • Reducing the use of energy • Turn off lights and unused appliances • Close doors or windows to trap heat • Use proper insulation • Recycling • Consolidate trips or passengers to reduce oil usage

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