Essential Energy
Lesson 1
There are five forms of Energy in Action
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Heat
Light
Electrical
Sound
Movement (Kinetic)
Lesson 2
There are 4 types of stored energy
Stored = potential = about to happen later
• Gravitational PE – energy stored in things
when they are high up
• Chemical PE – energy stored in chemicals
• Nuclear PE – energy stored inside the nucleus
of atoms
• Strain PE – energy stored in things when they
are stretched or squashed
Energy Changers 3
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Gas fire
Bow and arrow
Radio
Hair straighter
TV
Lift going up
• Guitar string
• Microphone
• Battery torch
chemical PE  heat
Strain PE  kinetic
electrical  sound
electrical  Heat
electrical  sound + light
electrical  movement +
gravitational PE
movement  sound
sound  electrical
chemical PE  light + heat
Gravitational PE  Kinetic
Position
Type
A
Kinetic
B
Gravitational PE + Kinetic
C
Gravitational PE
Roller Coaster Energy
Gravitational Potential Energy
• Gravitational PE  Kinetic Energy
• Gravitational Potential energy can be to
power a radio
Lesson4
Wasted Energy
• Most machines waste energy in the form of heat and a
little noise.
• The heat and sound spread out into the surroundings
and becomes useless.
• Energy is never completely disappear it is only wasted
and spreads out.
• In a car engine 30% of the energy from the petrol is
converted into kinetic energy to produce movement –
the rest of the petrol's energy is converted to heat and
sound energy.
• Video on energy transfers of in a car
• Link to PowerPoint on energy transfers and waste
Lesson 4 Sankey Diagram
for old fashioned filament light bulb
Only 10% is actually
converted into light
Lesson 4 Sankey Diagram
for energy saving light bulb
75%% is converted into light
Lesson 4 Sankey Diagram
for Coal fired power station
Lesson 4 Sankey Diagram
for Petrol Engine
Lesson 4 Sankey Diagram
for Human Body
Lesson 4 Sankey Diagram For a
Microwave oven
Kinetic
Microwave
Total Energy from mains
electrical supply
Lesson 4 Sankey Diagram For a Car
Kinetic 30%
Car
Total Energy from
Chemical PE in petrol
100%
Lesson 6 Pendulum Challenge
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The period of a pendulum is the time a pendulum
takes to swing forward and back to its stating point
Equipment
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String
Pendulum bob
Meter stick
Timer
Clamp stand
Wooden dowel
You have to find out what length of string will give a
period of 1 second in other words 60 swings in one
minute
In groups decide upon a plan and carry out the
investigation.
You will be changing the length but what ting
should you keep the same during the experiment
in order to make it a fair test
Make a poster showing with a clear diagram of
your equipment, a note of how you did the
experiment and your results.