2. What is Energy Transformation?
All changes you can detect around you are due to
energy transformation
Vital to survival
Energy cannot be made or destroyed
3. City in the past
Source of light coal, wood, candles
Source of movement animals
4. City Today
Source of light electricity
Source of movement petrol or diesel
5. Measuring Work
The formula is :
work = force x distance
E.g. : 10N x 2m = 20Nm/ 20 J ( Joule )
Work occurs when a force moves an object
through a distance
6.
7. Making a Calculation
The weight of an object is measure in N
(Newton)
The distance is measure in m ( Meter )
12. Sankey Diagram
It is the other way to show energy transformation,
the width of the arrows indicate the amount of
energy
13. A :
Light bulb 100
J
Light energy 10 J
Waste
heat
energy
90 J
Q : Draw a sankey diagram for
light bulb that have input
energy of 100 J and the output
of light energy 10 J and heat
energy 90 J
14. Plants and Energy
When a seed of a plant is dig in the soil it use
chemical energy in the seed to grow and when it
reach the surface of the soil it start to grow
leaves.
17. Energy and Ourselves
In a can of food there is amount of energy written.
This are measure in Joule and Kilo Joule.
18. Chemical in your body is release in a process
called respiration.
Most of chemical energy in your body is use for
movement ( kinetic energy) and for keeping your
body warm ( Heat energy).
19. Generating Electricity
It is a very useful form of energy
Michael Faraday (1791-1867) discovered that an
electric current could be made to flow in a wire.
20. Bicycle dynamo
Bicycle dynamo have a wheel in its top. When
the wheel is in contact with the tyre it rotates and
generate electricity which provide the lamp for the
bicycle.
21. The power station generator
The water is boiled and change into steam.
The steam turn the turbine.
The electromagnet producing electricity in the
coils and direct it to the transformer.
The transformer change the voltage to the higher
one and ready to being given to the public.
