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09 10 Energy Sources Carol
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09 10 Energy Sources Carol

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  • 1. Energy resources
  • 2. Natural Resources
    • A natural resource is a feature of Earth that benefits people.
    • Earth’s natural material resources are things like air, fresh water, and soil.
  • 3. 16.2 Electricity from fossil fuels
    • A nonrenewable resource is not replaced as it is used.
    • Because it takes so long for these resources to form, someday we will not have enough fossil fuels to produce the electricity we need.
    • The three major fossil fuels are coal, oil, and natural gas.
    Video clip on fossil fuels
  • 4. COAL, PETROLEUM, AND GAS
    • Coal , petroleum , and natural gas are considered nonrenewable because they can not be replenished in a short period of time. These are called fossil fuels.
    Video clip on fossil fuels Video clip on reliance on fossil fuels
  • 5. HOW IS COAL MADE ???
  • 6. HOW ARE OIL AND GAS MADE ???
  • 7. Electricity from renewable resources (often called alternative energy sources)
    • A renewable resource can be replaced naturally in a relatively short period of time.
    • The Sun and wind are renewable resources that can be used as energy sources.
  • 8. Electricity from renewable resources
    • It is also possible to use:
      • moving water (hydroelectric)
      • hot spots near Earth’s surface (geothermal)
      • Energy from plant material (biomass)
      • Let’s look at some of these!
  • 9. Nuclear Power is a non-renewable but alternative energy Energy released by fission (or fusion) reaction.
  • 10.  
  • 11. This is steam, not polluted air!
  • 12. Video clip on nuclear power
  • 13.
    • Nuclear power costs about the same as coal,
    • so it's not expensive to make.
    • Does not produce smoke or carbon dioxide,
    • so it does not contribute to the greenhouse effect.
    • Produces huge amounts of energy from
    • small amounts of fuel.
    • Nuclear power is reliable.
    Advantages
  • 14. - Although not much waste is produced, it is very, very dangerous. It must be sealed up and buried for many years to the radioactivity to die away. - Nuclear power is reliable, but a lot of money has to be spent on safety . If it does go wrong, a nuclear accident can be a major disaster. Disadvantages
  • 15.  
  • 16.  
  • 17. Buford Dam at Lake Lanier
  • 18. Buford Dam at Lake Lanier
  • 19.  
  • 20. Video clip on Hydroelectric power
  • 21. - Once the dam is built, the energy is free. - No waste or pollution produced. - Much more reliable than wind, or solar power. - Water can be stored above the dam ready to cope with peaks in demand. - Electricity can be generated constantly. Advantages
  • 22. Disadvantages
    • The dams are very expensive to build. However,
    • many dams are also used for flood control or
    • irrigation, so building costs can be shared.
    • - Building a large dam will flood a very large area
    • upstream, causing problems for animals that
    • used to live there.
    • - Finding a suitable site can be difficult –
    • the impact on residents and the
    • environment may be unacceptable.
  • 23. Wind power Windmills are built together in a “wind farm.” The use of a windmill to drive an electric generator.
  • 24.  
  • 25.  
  • 26. Video clip about Wind power
  • 27. How good an area for wind power is GA?                                                                       
  • 28.
    • Wind is free, wind farms need no fuel.
    • Produces no waste or greenhouse gases.
    • The land beneath can usually still be used for farming.
    • Wind farms can be tourist attractions.
    • A good method of supplying energy to remote areas.
    Advantages
  • 29.
    • The wind is not always predictable –
    • some days have no wind.
    • Suitable areas for wind farms are often near
    • the coast, where land is expensive.
    • Noisy. A wind generator makes a constant,
    • low, "swooshing" noise day and night. An entire wind farm makes quite a racket!
    • Can kill birds - migrating flocks tend to
    • like strong winds. Splat!
    Disadvantages
  • 30. Solar power Several ways to use the sun for power! The energy received by Earth from the sun in the form of radiation.
  • 31. Solar cells to make electricity like your solar calculator does.
  • 32. Info on picture Solar power plants that can produce large amounts of electricity instead of for one house.
  • 33. Places where solar power plants would work!
  • 34. We even use solar power in orbit! Why would that be a good way to power satellites? Video clip on solar power
  • 35.
    • Solar energy is free - it needs no
    • fuel and produces
    • no waste or pollution.
    • In sunny countries, solar power
    • can be used
    • where there is no easy way to get
    • electricity to a remote place.
    Advantages
  • 36. Doesn't work at night. Very expensive to build solar power stations. Solar cells cost a lot to make. Can be unreliable unless you're in a very sunny climate. Disadvantages
  • 37. Geothermal energy The energy produced by heat within the Earth.
  • 38. Sometimes it is very close to the surface.
  • 39.  
  • 40. Video clip on geothermal energy
  • 41. What do you think would be the advantages and disadvantages of geothermal energy?
  • 42.  
  • 43.  
  • 44. Biomass is the second most common form of renewable energy.
  • 45. What do you think would be the advantages and disadvantages of biomass energy? Short video review of energy
  • 46.  
  • 47.
    • Use them only when necessary.
    • Take care of them even when you are
    • not using them.
  • 48.  
  • 49. Soil Conservation n
    • any method to maintain the fertility of the soil by protecting it . erosion
  • 50. Soil Conservation Techniques
    • Contour Plowing : farmers plow across the slope of hills to prevent erosion.
    • Terracing : changes one steep hill into a series of smaller, flatter fields.
    • Crop Rotation : farmers rotate the crops in their fields to use either less, or different nutrients from the soil.
    • No-till farming : is the practice of leaving old stalks on the field instead of picking them up. It provides cover from the rain, and prevents erosion.