Kaw energy and_energy_conversions

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Text of Kaw energy and_energy_conversions

  • 1. Energy and Energy Conversion
  • 2. Notice of Use Restrictions
    • Certain materials in this presentation are included under the Fair Use exemption of the U.S. Copyright Law and/or under the Fair Dealing exemption of the Ireland Copyright and Related Rights Act, 2000
    • Materials are included in accordance with the [U.S.] multimedia fair use guidelines; and
    • Materials are restricted from further use.
    • EDMAN YOST, J. (1999), Copyright Chaos - An Educator's Guide to Copyright Law and Fair Use, Intel Teach to the Future CD
  • 3. Lesson 1 OP15 Define and give the units for energy. - also give examples of energy in everyday experience. OP18 Explain why the sun is considered our primary source of energy and how this is important in food production and energy supply. OP21-a Identify different forms of Energy
  • 4. What is Energy?
    • Energy is all around us.
      • It can be heard as sound.
      • It can be felt as wind.
      • It can be seen as light.
  • 5. What is Energy?
    • We define Energy as the ability to do work.
    • It is measured in Joules (J) or Newton Meters (Nm)
    • We have energy if we can move something.
    • When the golfer swings he moves:
      • The Club
      • The Ball
      • Himself
      • The Air
  • 6. Forms of Energy
    • Energy can be stored in many forms:
      • Potential Energy
      • Kinetic Energy
      • Heat Energy
      • Chemical Energy
      • Sound Energy
      • Electrical Energy
      • Magnetic Energy
      • Solar Energy
      • Nuclear Energy
  • 7. Potential Energy
    • Potential Energy is stored energy a body has due to its position.
    • An object that has been raised above its resting place under gravity has potential energy:
    • e.g. Weight held at a height
    • Potential Energy is stored in a stretched spring
  • 8. Kinetic Energy
    • Kinetic energy is stored in a body that is moving.
    • Cars and Aeroplanes have Kinetic energy because they can move people and goods.
  • 9. Heat Energy
    • Heat energy can also be used to move things.
    • Heat energy causes the alcohol to rise in a thermometer.
    • Heat causes warm air to rise making hot air balloons go up.
  • 10. Chemical Energy
    • Chemical energy is stored inside materials in chemical bonds holding them together.
    • The food we eat contains stored chemical energy
    • This provides us with the ability to move and do work.
    • Chemical energy is released when fuel such as coal and oil are burned.
  • 11. Sound Energy
    • Sound stores energy which causes our eardrums to vibrate so that we can hear.
    • Sound energy can cause avalanches.
  • 12. Electrical Energy
    • Electrical Energy is due to moving charges.
    • Electrical Energy can be seen all around us:
    - When we flick the light switch - When we turn on the television
  • 13. Magnetic Energy
    • Magnets have the ability to move things.
    • They can cause paper clips to move towards them.
  • 14. Solar Energy
    • The Suns light is our most important source of energy.
          • The sun makes plants and crops grow providing us with food.
          • When plants decay over many years turf, coal and oil etc are formed.
        • - Solar cells can be used to store energy which provide heat and electricity.
  • 15. Nuclear Energy
    • This is the energy released when the nuclei of atoms split (fission) up or join together (fusion).
    • Fission:
    • When atoms are split in a nuclear reactor energy is released to make steam which moves large turbines that make electricity
    • Fusion:
    • When atoms are joined together in a nuclear reactor energy is released.
  • 16. Lesson 2
    • OP16 Classify sources of energy as renewable or non- renewable.
    • OP19 List the advantages and disadvantages of different energy sources, including nuclear sources of energy, as part of the solution to national energy needs
  • 17. Sources of Energy
    • There are two groups of energy sources:
      • Non-renewable sources
        • Fossil fuels
      • Renewable sources
        • Solar Energy
        • Hydro-Electricity
        • Nuclear Energy
        • Wind Energy
        • Tidal and Wave Energy
        • Biomass Energy
        • Geothermal Energy
  • 18. Fossil Fuels
    • Plants and organisms absorbed energy from the sun and decayed over millions of years.
    • This was compressed over a long period of time and became oil, coal, gas and turf.
    • Advantages:
      • High concentration of energy.
    • Disadvantages:
      • Causes gases to be sent into the atmosphere causing pollution.
      • Contributing to Climate change.
      • Running out.
  • 19. Solar Energy
    • Solar Energy is Energy from the sun.
    • Advantages:
      • Renewable.
      • Can heat houses.
      • Can produce electricity.
      • Doesnt cause pollution
    • Disadvantages:
      • Expensive
      • Not possible to produce as much electricity as a generating station without covering many square km with solar cells.
  • 20. Hydro-Electricity
    • Hydro-electricity is energy from the potential and kinetic energy of water.
    • Advantages:
      • Renewable.
      • Produces electricity.
      • Doesnt cause pollution
      • Cost efficient.
    • Disadvantages
      • Causes flooding.
      • Destroys habitats for plants and animals
  • 21. Nuclear Energy
    • This is energy from making or breaking nuclear bonds.
    • Advantages:
      • Renewable
      • Can be produced in large amounts.
      • Relatively cheap.
    • Disadvantages:
      • Radioactive waste is harmful or even deadly.
      • Radiation from waste can last for hundreds and thousands of years.
      • Not possible to dispose of waste without causing damage to future generations?
  • 22. Wind Energy
    • Wind energy is from the kinetic energy of the wind.
    • Wind farms consist of vertical masts with large propellers that turn in the wind and produce electricity.
    • Advantages:
      • Renewable.
      • Doesnt cause pollution.
      • Produces electricity.
    • Disadvantages:
      • More than a thous