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Published byClement Strickland Modified over 9 years ago
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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
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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?
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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?
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Energy Diagram 500 J 200 J 300 J Electricity Heat Light We show how energy is transferred using Energy Diagrams
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Energy Diagrams 500 J 200 J 300 J What’s wrong with this Energy diagram? Electricity Heat Light
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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
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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
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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?
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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”
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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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