1. Energy Transfer Diagrams Starter Activity (back of jotters): 1)What are the 10 types of energy? 2)Draw an energy flow diagram for an ipod

2. Chemical potential energy in food Kinetic Energy Sound Energy Heat Energy Energy Changes What are the energy changes for a person on a tricycle? What is wasted and what is useful energy?

3. Battery powered television set Chemical potential energy in battery Electrical Energy Light Energy Sound Energy Heat Energy What is wasted and what is useful energy?

4. Energy Diagram 500 J 200 J 300 J Electricity Heat Light We show how energy is transferred using Energy Diagrams

5. Energy Diagrams 500 J 200 J 300 J What’s wrong with this Energy diagram? Electricity Heat Light

6. Accurate Energy Diagrams 10J electrical energy in 1J useful light energy out 9J wasted heat energy out Filament bulb The total energy in is equal to the total energy out

8. Draw an Energy diagram for the following on graph paper. 1) A lawnmower. Input: 100J electrical Output: 70J useful kinetic 30J wasted heat 2) A wood fireplace Input: 100J chemical potential Output: 40J useful light 40J useful heat 20J wasted sound

9. 10J electrical energy in 1J useful light energy out 9J wasted heat energy out 10J electrical energy in 4J useful light energy out Filament bulb Energy efficient bulb 6 J wasted heat energy out Which light bulb would you buy and why?

10. Energy Efficiency An Energy Diagram can tell us how much useful and wasted energy we will get from a device like a bulb. The more useful energy we can get out of it, the better. This is called the “energy efficiency”

11. Energy Labels Machines have labels which tell customers how efficient their appliance (washing machine/TV etc) is. Why would we want to know this?