The document discusses different types of energy transfers and the law of conservation of energy. It provides examples of energy transfers, such as a candle transferring chemical energy into heat and light energy. It also discusses the main energy transfers that occur for objects like a car engine (chemical to kinetic and heat) and radio (electrical to sound and heat). The law of conservation of energy states that energy cannot be created or destroyed, only changed from one form to another, so the total energy input equals the total energy output during a transfer.

1. EnergyEnergytransfers

2. Match each of these to the type of energy that it containsA mug of coffeeKinetic energyA piece of coalElastic energyA coiled springChemical energyA moving bicycleHeat energy

3. EnergytransfersEnergy can bechangedfromoneformtoanother

4. Example:

5. A candlecontainschemicalenergy

6. Whenthecandleburnsthechemicalenergyistransferredinto…

7. Thesechanges canberepresentedbyenergyflowdiagrams

8. Chemicalenergyheatenergy + light energyEnergytransfersWhat are theenergytransfersfor a TV?lightsoundelectricalheat

9. EnergytransfersWhat are the main energy transfers for a car engine? kineticsoundchemicalheat

10. EnergytransfersWhat are the main energy transfers for a radio? soundheatelectrical

11. Energytransfers

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

13. Conservation of energyWhat 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 lightsoundelectricalheat

15. The law of conservation of energyEnergy 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 energy58%(Useful spinning of the drill bit)Energy Transfer ValuesElectrical energy100%Kinetic energy22%(Wasted vibration of the drill)Heat energy20%(wasted)