Energy efficiency Some might: all must: most should :

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Presentation transcript:

Energy efficiency Some might: all must: most should : By the end of this lesson... all must: Identify useful and waste energy types Recall the 8 common types of energy most should : Apply the conservation of energy to a range of appliances Calculate the efficiency of a range of devices Some might: Compare efficient and inefficient devices Energy efficiency

Light energy is given out Electrical energy goes into the lamp Light energy is given out

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 60J of light 100J of electrical 40J of heat

The energy transfers in a computer Sound + light energy ( 80 J ) Electrical energy ( 200 J ) ( )

Nintendo DS Light + sound ( 14 J ) Electrical energy ( ) (16 J)

Energy transfer within a car ( 7,200 J ) 8,000 J Heat + sound ( )

Energy types Recall the 8 common types of energy Sound energy Heat energy Chemical energy Light energy Gravitational potential energy Elastic potential energy Electrical energy Kinetic energy Key word Pronunciation Definition Conservation of energy kon-ser-vey-shuh Energy can neither be created or destroyed during a transfer of energy. Recall the 8 common types of energy All Learning objectives Apply the conservation of energy to a range of appliances Most

Calculating efficiency Example 25 J light 100 J electrical 75 J Heat Identify useful and waste energy types All Learning objectives Calculate the efficiency of a range of devices Most

Sankey diagrams 7 squares = 7 joules 10 Joules electrical energy 1 square is 1 joule of energy

Gravitational potential energy Energy splat! Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy Watch this space!

Gravitational potential energy Energy splat! 1 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What is the useful energy ?

Energy splat! 2 What is the useful energy? Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What is the useful energy?

Gravitational potential energy Energy splat! 3 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What is the useful energy produced in the moving air?

Gravitational potential energy Energy splat! 4 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy is generated from a wind turbine?

Gravitational potential energy Energy splat! 7 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy is generated?

Gravitational potential energy Energy splat! 8 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy is used up by the kettle?

Gravitational potential energy Energy splat! 9 Kinetic energy Sound energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy is generated?

Gravitational potential energy Energy splat! 11 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy is stored in the match?

Gravitational potential energy Energy splat! 12 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy An object high above the Earth has lots of this type of energy!

Gravitational potential energy Energy splat! 13 Kinetic energy Heat energy Gravitational potential energy Electrical energy Chemical energy Light energy What type of energy does coal contain?

Energy splat! 14 100 joules 75% 20% 50 joules 200 joules 1,000 joules light 200 J in What is the efficiency 50 J in

Energy splat! 15 How much waste energy? 100 joules 25 joules 20% light How much waste energy? 500j in ?? j waste