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# 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.