s1 types of energies and energy transfer
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Teachers Notes Energy Transfer Circus:-
Wind up toys Kettle
Balloons and duster cloth
Torch
Energy Transfer Unit (from MUTR)
Electric Motor pulling up weights
Lamp and Solar Cell connected to a fan
Fan and Windmill connected to a light bulb
Burning Demo:-
Pouring CO2 Demo (can be done as a class practical). Vinegar,candle light, baking soda.
Burning Hands Demo
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HOMEWORK
Design two posters with the followingtitles: How Coal was made
How Petrol was made
Due
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What do you knowabout Energy?
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Energy Transfers and CombustionLesson Outcomes
To be able to list at least 3 differenttypes of energies and give examples ofenergy transfers.
To be able to explain the combustion
triangle. To be able to explain the difference
between a good and a bad fuel.
Key Words:- Electrical, Potential, Joule, Fuel, Combustion,Transfer, Conservation, Thermal, Sankey Diagram
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The Nine Types of Energy
Types ofEnergies
KineticEnergy
PotentialEnergy
ThermalEnergy
Nuclear
Elastic
Gravitational
Chemical
SoundLight
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The 9 types of energy
Type 3 example sources
Heat
Kinetic (movement)
Nuclear
Sound
Light
Chemical
Electrical
Gravitational potential
Elastic potential
Type 3 example sources
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02/01/2015Energy changes
To describe an energy change for alight bulb we need to do 3 steps:
Electricity Light + heat
1) Write down the
starting energy:
3) Write down
what energy typesare given out:2) Draw an arrow
What are the energy changes for the following?
1) An electric fire
2) A rock about to dropping through the air
3) An arrow being fired
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Energy Transfer Circus
Either Demonstrate or students go around
the energy transfer circus.
At each station/demo students draw an
appropriate Energy Transfer diagram.
If demonstrating students can write Energy
transfer diagrams on mini white boards.
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How energy is transferred
Energy itself is invisible. This activity should helpyou to understand that you can track energy by whatit does, and to start to understand where energycomes from and goes to.
Equipment
Around the room there are 10 stations. At each one issome equipment set up. Your teacher will tell you whichstation to start at.
Safety Keep Bunsen burner flames turned to the yellow safety flame.
Obtaining evidence
Draw up a table like the one shown below.
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name of
device
energy input useful
energy
output
waste
energy
output
Another
example of
the same
energy
transfer
Example Bunsenburner
Chemical Heat Light
Sound
Heat
Cooker
Station 1
Types of energythermal (heat)
kinetic (movement)
sound
light
electrical
chemicalgravitational potential
strain
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Sankey diagrams
Consider a light bulb. Lets say that the bulb runs on 100watts (100 joules per second) and transfers 20 joules persecond into light and the rest into heat. Draw this as adiagram:
100 J/s
electricalenergy
Input energy Output energy
80 J/s heatenergy (given to
the surroundings)
20 J/slight energy
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Example questions
Consider a kettle:
1) Work out each energy value.
2) What is the kettles
efficiency?
Soundenergy
Wastedheat
Heat towater
2000 J/selectricalenergy
Consider a computer:
150 J/selectricalenergy
10 J/s
wastedsound
20 J/swastedheat
Useful
light andsound
1) How much energy is convertedinto useful energy?
2) What is the computersefficiency?
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Energy Transfers and CombustionLesson Outcomes
To be able to list at least 3 different
types of energies and give examples ofenergy transfers.
To be able to explain the combustion
triangle. To be able to explain the difference
between a good and a bad fuel.
Key Words:- Electrical, Potential, Joule, Fuel, Combustion,Transfer, Conservation, Thermal, Sankey Diagram
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The Combustion Reaction
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What are the things needed forsomething to burn?
Watch some of these demos and see if
you can explain what is going on.
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The fire triangle
Click Image
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http://www.yenka.com/freecontent/item.action?quick=vb -
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Watch this clip and explain whyit shows some bad science.
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http://www.youtube.com/watch?v=4bSefSLaPFshttp://www.youtube.com/watch?v=4bSefSLaPFs -
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Energy Transfers and CombustionLesson Outcomes
To be able to list at least 3 different
types of energies and give examples ofenergy transfers.
To be able to explain the combustion
triangle. To be able to explain the difference
between a good and a bad fuel.
Key Words:- Electrical, Potential, Joule, Fuel, Combustion,Transfer, Conservation, Thermal, Sankey Diagram
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What is a fuel?
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F l
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FuelsA fuel is something that can be burned to release heat andlight energy. The main examples are:
Coal, oil and gas are called fossil fuels. In
other words, they were made from fossils.
Oil d f ti
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Oil and gas formation
C l f m ti n
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Coal formation
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Energy Transfers and CombustionLesson Outcomes
To be able to list at least 3 different
types of energies and give examples ofenergy transfers.
To be able to explain the combustion
triangle. To be able to explain the difference
between a good and a bad fuel.
Key Words:- Electrical, Potential, Joule, Fuel, Combustion,Transfer, Conservation, Thermal, Sankey Diagram