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
Energy Changes What are the energy changes for a person on a tricycle? Kinetic Energy Sound Energy Chemical potential energy in food Heat Energy What is wasted and what is useful energy?
Battery powered television set Electrical Energy Light Energy Chemical potential energy in battery Sound Energy Heat Energy What is wasted and what is useful energy?
Energy Diagram We show energy is transferred using Energy Diagrams 300 J Heat Electricity 500 J Light 200 J
Energy Diagrams What’s wrong with this Energy diagram? 300 J Heat Electricity 500 J Light 200 J
Accurate Energy Diagrams Filament bulb 9 J wasted heat energy out 1 J useful light energy out 10 J electrical energy in The total energy in is equal to the total energy out
Draw an Energy diagram for the following on graph paper. 1) A lawnmower. Input: 100 J electrical Output: 70 J useful kinetic 30 J wasted heat 2) A wood fireplace Input: 100 J chemical potential Output: 40 J useful light 40 J useful heat 20 J wasted sound
Which light bulb would you buy and why? Filament bulb 9 J wasted heat energy out 10 J electrical energy in 1 J useful light energy out Energy efficient bulb 6 J wasted heat energy out 10 J electrical energy in 4 J useful light energy out
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”
Energy Labels Machines have labels which tell customers how efficient their appliance (washing machine/TV etc) is. Why would we want to know this?
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