Unit 5 energy alberto s

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Unit 5 energy alberto s

  1. 1. Energy By Alberto fernández fernández
  2. 2. What is energy • Energy is the ability of an object to change things around it . • Energy can be mechanical, ligth, sound, thermal, electrical, chemic al or nuclear
  3. 3. Sources of energy • Sources can be : • Renewable : such as water , wind , sun , biomass , waves and tides
  4. 4. • Non-renewable :Fuels are sources of chemical of energy . Coal , natural gas , and petroleum are fuels . • Uranium and plutonium are sources of thermal energy .
  5. 5. Energy transforms • The speakers change the electricity into sound . • The waves and tides change mechanical energy into electricity .
  6. 6. Electricity • Electricity is a form of energy : • We can transport it easily through power lines . • It trasforms into other types of energy , the light energy of a light bulb
  7. 7. Electrical charges • Static electricity, it occurs when an object acumulates electrical charge .
  8. 8. Conducting and insulating materials • Electrical charges move easily through conducting materials . • Electrical charges cannot move through insulating materials like wood , rubber and plastic .
  9. 9. Electrical current . Electrical current is the movement of the electrical charges through a conducting material . ELECTRIC CIRCUIT The elements in a electric circuit are :
  10. 10. The generator
  11. 11. The conductor
  12. 12. The light bulb
  13. 13. Producing electricity HIDROELECTRIC POWER STATIONS : Use the energy from the reservoirs . Water moves a turbine and its generates electricity
  14. 14. • NUCLEAR POWER STATIONS : Use uranium or plutonium to produce thermal energy
  15. 15. • THERMAL POWER STATIONS: Burn fuels . Combustion heats water that is converted into steam . Steam moves a turbine and generates electricity
  16. 16. • WIND FARMS AND SOLAR POWER STATIONS : transform the wind and the sun energy .
  17. 17. Energy and the enviroment Producing and using energy causes problems . • Changes in the landscape . The construction of reservoirs changes the landscape
  18. 18. • Depletion . Fuels are non-renewable sources of energy and they can run out .
  19. 19. • Pollution . The burning of fuels produces gases that pollute the air
  20. 20. Using energy efficiently • Turn off the ligths
  21. 21. • Use public transport .
  22. 22. • Turn off the heaters and air conditioning when its possible . Insulate homes .
  23. 23. • Practise the 3 R `s : reduce , reuse and recycle .
  24. 24. Magnetism Magnetism is the ability of materials to attract metals such as iron and steel . There are two types of magnets , natural or artificial .
  25. 25. Uses of magnets • Magnets are used in door locks , bags … • Magnetism are used to store information on credit cards
  26. 26. Electromagnetism • Elctricity produces magnetism . • Magnetism produces elctricity .
  27. 27. • When the wheel turns , the magnet inside the dynamo turns and it creates an electrical current .
  28. 28. THE END

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