2. Outcomes
• 3- state some examples of energy. And that
the unit of energy is a joule.
• 4- classify objects by the type of energy they
have
• 5- explain why an object has a particular type
of energy.
• (6- organise energy types into similar groups
3. How can we describe energy?
•Listen to the song and see how many
energy types you can hear.
4. What are the main types of energy?
• Gravitational
• Elastic
• Light
• Heat
• Sound
• Chemical
• Kinetic,
• Electrical
There are others but they generally fit into these
categories.
8. How can we represent energy
Filament light bulb
transfers?100J
All the energy transfers
(useful and wasted) that are
associated with a device can
be represented by a Sankey
diagram.
A Sankey diagram uses
arrows to represent all the
output energies.
electrical
energy
(input)
Energy efficient light bulb
20J
electrical
energy
(input)
10J
light
energy
(output)
10J
light
energy
90J
heat energy
(wasted)
10J (output)
heat energy
(wasted)
The thickness of each arrow
is proportional to the amount
of energy involved at that
stage.
How does the energy use in
these light bulbs compare?
9. For each object ,
• Describe the object,
• What type of energy does it store?
• What is the output energy
• Is there any energy wasted.
10. Match the amount of energy to the
food
890 joules 594 joules 920 joules 1465 joules
