1. UNIT 10 –ENERGY ENERGY TYPES AND ENERGY SOURCES ESO 2 – SCIENCE 2009/2010 Ms. Mireia Molera EUROPA INT. SCHOOL

2. Previous concepts about energy What is energy? Types of energy Traditional sources of energy Alternative sources of energy UNIT 10 –ENERGY TYPES AND ENERGY SOURCES

3. PREVIOUS CONCEPTS ABOUT ENERGY ENERGY IS THE DRIVING FORCE OF THE WORLD  Chemical energy  Electrical energy  Thermal energy  Electromagnetic energy  Mechanical energy  Nuclear energy Energy from muscles Energy from animals Energy from water and wind Energy from fuels Energy from electricity TYPES OF ENERGY

4. 1. WHAT IS ENERGY ? Energy is the capacity to produce changes in material systems. Whenever a change is produced, energy is involved.

5. TYPES OF ENERGY  Chemical energy  Electrical energy  Thermal energy  Electromagnetic (Light and Sound)  Mechanical energy (Kinetic and Potential)  Nuclear energy (Nuclear Fission and Nuclear Fusion)

6. JOHN DALTON – Model atòmic Chemical energy Chemical energy is the energy stored by fuels or batteries (chemical compounds). It is released during chemical reactions Chemical reactions Batteries

7. JOHN DALTON – Model atòmic Electrical energy Electrical energy that is transported by electrical charges running along the circuit. It is easily transformable into other energies, such as thermal or light energy.

8. JOHN DALTON – Model atòmic Thermal energy Thermal energy is an energy that is interchanged when two systems at different temperature come into contact. This is energy which is released as heat.

9. JOHN DALTON – Model atòmic Electromagnetic energy: Light energy Light energy from the Sun allows plants to manufacture the foods which animals consume.

10. JOHN DALTON – Model atòmic Electromagnetic energy: Sound energy Sound energy is the energy the air carries. It is always produced by movement.

11. JOHN DALTON – Model atòmic Mechanical energy Mechanical energy is the energy objects have due to movement or their position: -Kinetic energy (movement) -Potential energy (position)

12. JOHN DALTON – Model atòmic Nuclear energy Nuclear energy is stored in the nuclei of atoms Nuclear fission (splitting of atoms) Nuclear fusion (combination of atoms) Uranium is a silvery- white metal that is used in nuclear power stations

13. JOHN DALTON – Model atòmic PHYSICAL CHANGES A physical change may cause any of the following: - Change of position - Changes of state - Deformation - Variation in temperature

14. JOHN DALTON – Model atòmic CHEMICAL CHANGES When a chemical changes occur, the following usually also occurs: Bubbles are formed Change of colour Change of temperature

15. JOHN DALTON – Model atòmic 2. NON-RENEWABLE SOURCES OF ENERGY 1. COAL 2. OIL 3. NATURAL GAS 4. URANIUM

16. JOHN DALTON – Model atòmic 3. RENEWABLE SOURCES OF ENERGY 1. BIOMASS ENERGY 2. HYDROELECTRIC ENERGY 3. SOLAR ENERGY 4. EOLIC ENERGY 5. GEOTHERMAL ENERGY 6. TIDAL ENERGY

17. Geothermal Coal Biomass Butane gas Petroleum Wind Uranium Natural gas Solar Hydropower RENEWABLE / NON-RENEWABLE SOURCES OF ENERGY

18. Geothermal Biomass Wind Solar Hydropower SOURCES OF ENERGY RENEWABLE NON-RENEWABLE Coal Butane gas Petroleum Uranium Natural gas

19. THE ENERGY OF FOODS The human body obtains the energy it needs (movement of the muscles, activities of various organs, etc.) from nutritional products. Energetic value of foods: (Kcal/100 g or kJ/100 ml)

20. UNIT 10 - Conceptual Map