Unit10: Energy

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Unit10: Energy

  1. 1. Energy What is energy?
  2. 2. What is energy? Energy is the capacity of an object or body to transform an energy source into work. The quantity of energy is the equivalent of the quantity of work.
  3. 3. Units of energy • The international System (IS) measures energy in joules (J) and kilojoules. 1000 J = 1 KJ • Heat energy is often measured in units called calories (cal) and Kilocalories (kcal). 1 cal = 4,18 J
  4. 4. Different types of energies
  5. 5. Muscle energy Years ago, muscle energy was the main source of energy, but we have invented different mechanisms and machines that have improved our quality of life. For example: ★Bicycles need our muscle energy when we move the pedals. ★Kitchen appliances need electricity to work, as televisions and computers.
  6. 6. Mechanical Energy ★Kinetic Energy ★Potential Energy
  7. 7. Electrical energy
  8. 8. Electromagnetic energy
  9. 9. Sound energy
  10. 10. Chemical energy
  11. 11. Nuclear energy
  12. 12. Thermal or calorific energy
  13. 13. POWER
  14. 14. t W is work, measured in joules (J) t is time, measured in seconds (s) P= W P is power, measured in watts (W) The power of a machine is the quantity of work it can do per unit of time. Power is expressed in the formula:
  15. 15. Transformation of energy It’s when we transform an initial form of energy into other forms of energy. Examples: Chemical to electrical energy, luminous to electrical energy...
  16. 16. Energy sources
  17. 17. What is? Energy sources are natural resources that provide different forms of energy. This energy is transformed for specific uses. They are classified into: ● renewable sources ● non-renewable sources
  18. 18. Renewable energy sources
  19. 19. Hydraulic energy
  20. 20. Solar energy: ➔Termal system: ➔Photovoltaic energy:
  21. 21. Wind energy
  22. 22. Marine energy ➔Tidal energy: ➔Wave energy: ➔Ocean Thermal energy:
  23. 23. Geothermal energy
  24. 24. Biomass
  25. 25. Municipal solid waste
  26. 26. Nuclear energy
  27. 27. Coal
  28. 28. Petroleum
  29. 29. Natural gas
  30. 30. Non- Renewable energies and the environment
  31. 31. Green house effect
  32. 32. Acid Rain
  33. 33. Oil Spills
  34. 34. Nuclear Waste
  35. 35. Rising Water temperature
  36. 36. Atmospheric Pollution
  37. 37. THE END By: Berta Parera, Marta Pera & Guisla Roig.

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