Energy Sources
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Energy Sources






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Energy Sources Presentation Transcript

  • 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. 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.
  • 5. Electricity from renewable resources
    • It is also possible to use:
      • moving water (hydroelectric)
      • hot spots near Earth’s surface (geothermal)
      • tides to produce electricity.
      • Let’s look at some of these!
  • 6. Hydroelectric - Using water to make power.
  • 7.  
  • 8. Buford Dam at Lake Lanier
  • 9. Buford Dam at Lake Lanier
  • 10.  
  • 11. Video clip on Hydroelectric power
  • 12.
    • Once the dam is built, the energy is
    • virtually free. No waste or pollution produced. Much more reliable than wind, solar or
    • wave power. Water can be stored above the dam ready
    • to cope with peaks in demand. Hydro-electric power stations can increase
    • to full power very quickly, unlike other
    • power stations.
    • Electricity can be generated constantly.
  • 13. 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. Water quality and quantity downstream
    • can be affected, which can have an
    • impact on plant life.
  • 14. Wind power Windmills are built together in a “wind farm.”
  • 15.  
  • 16.  
  • 17. Video clip about Wind power
  • 18. Wind power                                                                       
  • 19.
    • 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.
  • 20.
    • 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.
    • *Some people feel that covering the landscape
    • with these towers is unsightly.
    • Can kill birds - migrating flocks tend to
    • like strong winds. Splat!
    • Can affect television reception if you live nearby. Noisy. A wind generator makes a constant,
    • low, "swooshing" noise day and night,
    • which can drive you nuts. An entire wind farm makes quite a racket!
  • 21. Solar power Several ways to use the sun for power!
  • 22. Solar cells to make electricity like your solar calculator does.
  • 23. Info on picture Solar power plants that can produce large amounts of electricity instead of for one house.
  • 24. Places where solar power plants would work!
  • 25. We even use solar power in orbit! Why would that be a good way to power satellites? Video clip on solar power
  • 26.
    • 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.
  • 27. *Doesn't work at night. * Very expensive to build solar power stations. Solar cells cost a great deal compared to the amount of electricity they'll produce in their lifetime. *Can be unreliable unless you're in a very sunny climate. Disadvantages
  • 28. Tidal power
  • 29. Video clip on tidal power Turbines are placed underwater like with a dam. Tidal turbines have to spin 180 degrees because the tide switches directions 4 times a day!
  • 30. Advantages
      • Once you've built the dam, tidal power is free.
      • It produces no greenhouse gases or other waste.
      • It needs no fuel.
      • It produces electricity reliably.
      • Not expensive to maintain.
      • Tides are totally predictable.
  • 31.
      • Very expensive to build.
      • Affects a very wide area - the environment is changed for many miles upstream and downstream. *Many birds rely on the tide uncovering the mud flats so that they can feed. * Only provides power for around 10 hours each day, when the tide is actually moving in or out. *There are very few suitable sites for tidal power stations.
  • 32. Nuclear Power
  • 33.  
  • 34. This is steam, not polluted air!
  • 35. Video clip on nuclear power
  • 36.
    • 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. Produces small amounts of waste. Nuclear power is reliable.
  • 37.
    • Although not much waste is produced,
    • it is very, very dangerous. It must be sealed up and buried for many
    • years to allow 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.
  • 38. Geothermal energy The earth has lots of heat inside!
  • 39. Sometimes it is very close to the surface.
  • 40.  
  • 41. Video clip on geothermal energy
  • 42. What do you think would be the advantages and disadvantages of geothermal energy?
  • 43.