Energy Transformation
By: Devinda V.S, Firman OttoEnergy Transformation
What is Energy Transformation?All changes you can detect around
you are due to energy transformationVital to survivalEnergy cannot
be made or destroyed
City in the pastSource of light coal, wood, candlesSource of
movement animals
City TodaySource of light electricitySource of movement petrol
or diesel
Measuring WorkThe 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
Making a CalculationThe weight of an object is measure in N
(Newton)The distance is measure in m ( Meter )
Answer100N x 1m = 100J
Energy Transfer DiagramStrain Energy Catapult Kinetic energy
& Sound energy
Another exampleKinetic energy balloon strain energy
Sankey DiagramIt is the other way to show energy transformation,
the width of the arrows indicate the amount of energy
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
13
Plants and EnergyWhen 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.
Plant herbivorous carnivorous
Energy transfer for photosynthesis
Light energy + chemical energy chemical energy
Energy and OurselvesIn a can of food there is amount of energy
written. This are measure in Joule and Kilo Joule.
17
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).
Generating ElectricityIt is a very useful form of energy
Michael Faraday (1791-1867) discovered that an electric current
could be made to flow in a wire.
Bicycle dynamoBicycle 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.
The power station generatorThe 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.
Conservation of energy
Thank You For Your Attention
