Teacher’s Notes. Fuel Demos:- Ethanol in sealed test tube and Large Drinking Water container Large Hydrogen Balloon (pre-prepared) and meter ruler with a candle stuck at the end Model Power Station with fire lighter fuel OPTIONAL LITERACY EXTENSION TASK:- - PowerPoint PPT Presentation
Teacher’s Notes Teacher’s 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 • Fuel Demos:- – Ethanol in sealed test tube and Large Drinking Water container – Large Hydrogen Balloon (pre-prepared) and meter ruler with a candle stuck at the end – Model Power Station with fire lighter fuel • OPTIONAL LITERACY EXTENSION TASK:- – Three candles of different lengths, Large beaker. – CAMS HILL WRITING FRAMES 12/06/22
Transcript
Teacher’s NotesTeacher’s 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
• Fuel Demos:-– Ethanol in sealed test tube
and Large Drinking Water container
– Large Hydrogen Balloon (pre-prepared) and meter ruler with a candle stuck at the end
– Model Power Station with fire lighter fuel
• OPTIONAL LITERACY EXTENSION TASK:-– Three candles of different
lengths, Large beaker.– CAMS HILL WRITING
FRAMES
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HOMEWORKHOMEWORK
• Design two posters with the following titles:– How Coal was made– How Petrol was made
• Due
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What do you know about Energy?
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Energy Transfers and CombustionEnergy Transfers and CombustionLesson OutcomesLesson Outcomes
• To be able to list at least 3 different types of energies and give examples of energy transfers.
• To be able to explain the combustion triangle.
• To be able to explain the difference between a good and a bad fuel.
To describe an energy change for a light bulb we need to do 3 steps:
Electricity Light + heat
1) Write down the starting energy:
3) Write down what energy types are 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
Energy Transfer CircusEnergy 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 help you to understand that you can track energy by what it does, and to start to understand where energy comes from and goes to.
• Equipment• Around the room there are 10 stations. At each one is
some equipment set up. Your teacher will tell you which station 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.
name of device
energy input useful energy output
waste energy output
Another example of the same energy transfer
Example Bunsen burner
Chemical Heat Light
Sound
Heat
Cooker
Station 1
Types of energythermal (heat)kinetic (movement) soundlight
Consider a light bulb. Let’s say that the bulb runs on 100 watts (100 joules per second) and transfers 20 joules per second into light and the rest into heat. Draw this as a diagram:
100 J/s electrical energy
“Input” energy “Output” energy
80 J/s heat energy (given to
the surroundings)
20 J/s light energy
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Example questionsExample questionsConsider a kettle:
1) Work out each energy value.
2) What is the kettle’s efficiency?
Sound energy
Wasted heat
Heat to water
2000 J/s electrical energy
Consider a computer:
150 J/s electrical energy
10 J/s wasted sound
20 J/s wasted heat
Useful light and sound
1) How much energy is converted into useful energy?
2) What is the computer’s efficiency?
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Energy Transfers and CombustionEnergy Transfers and CombustionLesson OutcomesLesson Outcomes
• To be able to list at least 3 different types of energies and give examples of energy transfers.
• To be able to explain the combustion triangle.
• To be able to explain the difference between a good and a bad fuel.
What are the things needed What are the things needed for something to burn?for something to burn?
• Watch some of these demos and see if you can explain what is going on.
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What are the things needed What are the things needed for something to burn?for something to burn?
• Burning Demo – watch this demo / do it as a class. Can you explain why the flame goes out? What does this tell you about what is needed for something to burn?
1. Ethanol Rocket – Pour some Ethanol in the large Water Container and shake about for a few minutes. Pour out the Ethanol and carefully light the top of the bottle.
2. Light a large Hydrogen balloon using a meter ruler with a candle stuck at the end.
