1. Energy Energytransfers

2. Match each of these to the type of energy that it contains A mug of coffee Kinetic energy A piece of coal Elastic energy A coiled spring Chemical energy A moving bicycle Heat energy

4. Example:

5. A candlecontainschemicalenergy

6. Whenthecandleburnsthechemicalenergyistransferredinto…

7. Thesechanges canberepresentedbyenergyflowdiagrams

9. Energytransfers What are the main energy transfers for a car engine? kinetic sound chemical heat

10. Energytransfers What are the main energy transfers for a radio? sound heat electrical

11. Energytransfers

12. A hair dryer changes __________ energy to __________ energy, ________ energy and ______ energy The Sun changes __________ energy to ________ energy and _______ energy. When a catapult is released it changes ________ energy to ______________ ___________ energy and __________ energy.

13. Conservation of energy What happens to the total energy of a system before and after and energy transfer? It remains the same but exists in different forms “Energy cannot be created or destroyed. It can only be changed from one form to another.”

14. The amount of electrical energy which is inputted equals the total amount of energy outputted light sound electrical heat

15. The law of conservation of energy Energy can be transferred in more than one form at a time. The INPUT energy will always equal the total OUTPUT energy. “Energy cannot be created or destroyed. It can only be changed from one form to another.”

16. Kinetic energy 58% (Useful spinning of the drill bit) Energy Transfer Values Electrical energy 100% Kinetic energy 22% (Wasted vibration of the drill) Heat energy 20% (wasted)