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Energy
L1: Introduction to Energy
Learning Objectives:
1. Recall the different forms of energy.
2. Understand the law of conservation of energy.
3. Describe energy transfers.
Task
• Can you think of all the different forms of energy?
• Write down as many types of energy as you can think of –
HINT: there are 9.
Types of energy
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Light
Sound
Thermal (heat)
Electricity
Chemical
Elastic or Strain
Kinetic (movement)
Gravitational Potential
Nuclear (from nucleus of atoms)
Types of energy
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Light
Sound
Thermal (heat)
Electricity
Chemical
Elastic or Strain
Kinetic (movement)
Gravitational Potential
Nuclear
• Which types are
stored energy?
Types of energy
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Light
Sound
Thermal (heat)
Electricity
Chemical
Elastic or Strain
Kinetic (movement)
Gravitational Potential
Nuclear
• Fuels store chemical
energy
• Stretched objects
store elastic energy.
• Gravitational
potential energy is
the energy stored in
objects above the
ground.
Energy changes
Instructions:
For each demonstrated action describe:
a) What happens
b) Draw energy changes as in the example.
e.g. A book hitting the floor:
Kinetic energy
Sound + thermal (heat).
Electricity  Light + Thermal (Heat)
Gravitational Potential  Kinetic + Elastic + GP 
Elastic (Strain) + Gravitational Potential
Gravitational  Kinetic  Sound + Thermal
Chemical  Light + Thermal (Heat)
Chemical  Kinetic + Thermal (Heat) + Sound
Electricity  Kinetic + Sound + Heat
Law of Conservation of Energy
• Energy cannot be created or destroyed, only change form.
• We say that energy is transferred from one type to another.
• This means that in an energy transfer, the amount of energy
going in must be the same as the amount of energy coming
out (only the type of energy is different).
Energy Transfers
• Energy is measured in joules (J).
• Example: Light bulb
100 J Electrical energy  70 J light energy + 30 J heat energy
Video
• https://www.brainpop.com/science/energy/formsofenergy/