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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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02/01/2015

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