Some might: Compare efficient and inefficient devices Some might: Compare efficient and inefficient devices ENERGY EFFICIENCY most should : Apply the conservation of energy to a range of appliances Calculate the efficiency of a range of devices most should : Apply the conservation of energy to a range of appliances Calculate the efficiency of a range of devices all must: Identify useful and waste energy types Recall the 8 common types of energy all must: Identify useful and waste energy types Recall the 8 common types of energy By the end of this lesson...
Light energy is given out Electrical energy goes into the lamp
Kinetic energy Anything that moves has kinetic energy
Gravitational potential Anything lifted up above the Earth will have gravitational potential energy
The conservation of energy When energy is transferred. energy can not be created or destroyed 100J of electrical 60J of light 40J of heat
The energy transfers in a computer Electrical energy ( 200 J ) Sound + light energy ( 80 J ) ( )
Nintendo DS (16 J) Electrical energy ( ) Light + sound ( 14 J )
Energy transfer within a car 8,000 J ( 7,200 J ) Heat + sound ( )
Energy types Sound energy Heat energy Chemical energyLight energy Gravitational potential energy Electrical energyKinetic energy Key wordPronunciationDefinition Conservation of energykon-ser-vey-shuhEnergy can neither be created or destroyed during a transfer of energy. Recall the 8 common types of energy Apply the conservation of energy to a range of appliances All Most Elastic potential energy Learning objectives
Calculate the efficiency of a range of devices Example 100 J electrical 25 J light 75 J Heat Calculating efficiency Identify useful and waste energy types Learning objectives All Most
Sankey diagrams 10 Joules electrical energy 1 square is 1 joule of energy 7 squares = 7 joules 3 squares = 3 joules
Energy splat! Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy Watch this space!
Energy splat! 1 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What is the useful energy ?
Energy splat! 2 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What is the useful energy?
Energy splat! 3 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What is the useful energy produced in the moving air?
Energy splat! 4 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What type of energy is generated from a wind turbine?
Energy splat! 7 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What type of energy is generated?
Energy splat! 8 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What type of energy is used up by the kettle?
Energy splat! 9 Kinetic energy Gravitational potential energy Sound energy Chemical energy Light energy Electrical energy What type of energy is generated?
Energy splat! 11 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What type of energy is stored in the match?
Energy splat! 12 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy An object high above the Earth has lots of this type of energy!
Energy splat! 13 Kinetic energy Gravitational potential energy Heat energy Chemical energy Light energy Electrical energy What type of energy does coal contain?
50 J in 150 J light Energy splat! joules 20% 75% 200 joules 1,000 joules 50 joules What is the efficiency 200 J in
?? j waste 300j light Energy splat! joules 20% 25 joules 200 joules 1,000 joules 50 joules How much waste energy? 500j in