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Sources Of Energy Chapter 5---Section 3.

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Presentation on theme: "Sources Of Energy Chapter 5---Section 3."— Presentation transcript:

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: Coal:
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




8 Nuclear Energy Comes from the nuclei of unstable atoms Advantages-
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


10 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


12 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

13 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


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

16 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


18 Wind Energy Windmills Advantage Disadvantage
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


20 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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