1. 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

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

3. Kinetic energy
Anything that moves has kinetic energy

4. Gravitational potential
Anything lifted up above the Earth will have gravitational potential energy

5. The conservation of energy
When energy is transferred.
energy can not be created or destroyed
60J of light
100J of electrical
40J of heat

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

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

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

9. 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

10. 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

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

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

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

14. 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?

15. 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?

16. 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?

17. 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?

18. 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?

19. 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?

20. 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?

21. 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!

22. 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?

23. 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

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