4.4

Efficiency = Useful Energy Out / Total Energy In x 100
Total Energy In = Useful Energy In (j)
Useful Energy Out = Useful Energy Out (j)
Efficiency = Efficiency (%)

1) Work out each every value.

Total Energy In =2000j
Useful Energy Out = 1000j
Heat Energy Out = 1200j
Sound Energy Out = 1400j

2) What is the kettle's efficiency?
Eff=UEO/UEIx100
Eff=1000/2000x100
Eff=50%

Things to improve

3.17

3.16 Gapfill

3.16 construct ray diagrams to illustrate the formation of a virtual image on a plane mirror.

Obj 3.15- Recall that the angle of Incidence equals the angle of reflection

Obj 3.15- Recall that the angle of Incidence equals the angle of reflection

All Artwork Done by me.
Copyright © Jims Days 2011.