1. Questions Open your workbook to page 31 and 32 and do the questions. Use your notes from last class and your textbook to help you.

2. Different Forms of Energy

3. What is Energy? The ability to do work or cause change.

4. In this topic you will learn about the different forms of energy. Elastic Radiation Sound Electrical Chemical Hydraulic Thermal Wind Nuclear

5. Elastic Energy Energy stored in an object due to its compression or extension Name two examples of elastic energy 1)Compressed Spring 2)Stretched Elastic

6. Electrical Energy The energy resulting from the flow of electrons Name two examples: 1)Battery 2)Generator

7. Thermal Energy Thermal energy (heat) is the energy resulting from the random movements of atoms and molecules. Name one example: 1) Fire

8. Radiant Energy Radiant (light) energy is the energy of electromagnetic waves. Name two examples: 1)Light bulb 2)Cellphone

9. Chemical Energy The energy stored in bonds between atoms Name two examples: 1) Fossil Fuels (Oil, Natural Gas) 2) Candle Wax

10. Wind Energy Energy resulting from the movement of air Name an example: 1) Wind

11. Sound Energy Energy contained in and transported by sound waves. Two Examples: 1)Sound 2)Music

12. Hydraulic Energy Energy resulting from the flow of water Give two examples: 1)Waterfall 2)River

13. Nuclear Energy Is energy stored in the nucleus of an atom

14. Energy can be neither created nor destroyed Energy can be transferred from one place to another or transformed into another form of energy. Chemical energy to Electrical energy to Light and heat

15. What is the difference between an energy efficient light bulb and a non-energy efficient light bulb? 25% efficiency 25% of electrical energy is converted to light. 75% of electrical energy is converted to heat. 5% efficiency 5% of electrical energy is converted to light. 95% of electrical energy is converted to heat.

16. Energy efficiency is the amount of input energy (electrical energy) transformed into the required energy (light energy). Energy Efficiency(25%) = 25 Joules of light energy 100 Joules of electrical energy Energy Efficiency(5%) = 5 Joules of light energy 100 Joules of electrical energy

17. Question You have just bought a light bulb in the store and you calculate that for every second 50 Joules of electrical energy are transformed into 45 Joules of light energy and 5 Joules of heat energy. What is the efficiency of the light bulb? Energy Efficiency = 45 Joules of light energy x100 = 90% 50 Joules of electrical energy

18. Class Work Read pages 70 – 74 of your textbook Do questions 1 – 5 on page 99 of your textbook Do pages 33-34 of your workbook