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CHAPTER 6
Sources of Energy
Listing various forms and sources of energy on
Earth
Identify energy changes
Explaining the main source of energy
6.1 Various forms and sources of Energy
Energy is defined as the ability to do work
What is Energy?
Forms of Energy
Various Forms Of Energy
LIGHT ENERGYEnergy which enables us to see
Various Forms Of Energy
KINETIC ENERGYEnergy possessed by a moving object
A moving vehicle
A flying bird
Various Forms Of Energy
POTENTIAL ENERGYEnergy stored in a body due to its condition or position
Energy stored due to its
condition
Energy stored due to its
position
Various Forms Of Energy
SOUND ENERGYThe energy produced by vibrating object
Sound energy can be
detected by our ears.
Sound energy is important
because it enables us to
communicate and have
entertainment.
Sound is also used to alert
people of something
Various Forms Of Energy
HEAT ENERGY
We know from our experience in
daily life that the condition
shown in these pictures feels
hot.
We say that the objects have
heat energy.
Heat energy can be detected by
our skin
Various Forms Of Energy
ELECTRICAL ENERGYEnergy caused by the flow of electrical current
The form of energy that makes
them function is called
electrical energy.
All the above appliances need
energy to function
Various Forms Of Energy
CHEMICAL ENERGYEnergy stored in a substance
We can get energy we need to do work
form our food. Burning fuels such as
petrol, coal and firewood gives us heat
energy.
These energy can
be released during
burning or
respiration
Various Forms Of Energy
NUCLEAR ENERGYReleased from fission or fusion reactions which occur in atomic nuclei
Nuclear energy is
obtained from
elements such as
plutonium and
uranium.
Nuclear energy is mostly
used to generate electicity.
Some ships and submarines
are powered by nuclear
energy
Sources of energy
Fossil Fuels
Coals, petroleum,
natural gas are
examples of fossil
fuels.
Burning of fossil
fuels produces heat
and light
They are used for
cooking, generating
electrical energy,
heating homes
during winter, etc.
The sun as the primary source of energy
Air
Wind
Wave
Water
Cloud
Rain
Hydro energy
Plants
Animals
Fossil Fuels Biomass
Natural gas Coal Petroleum
Earth
Radioactive
metalsGeothermal
Energy Changes
Electrical
Heat
Solar
Electrical
Electrical
Kinetic
Sound
Chemical
Light
Heat
Chemical
Kinetic
Wind
Electrical
Iron
Solar panel
radioWind electric generator
Lawn mower
A lighted candle
CHAPTER 6
Sources of Energy
Define renewable and non-renewable sources of
energy
Group the various sources of energy into
renewable and non-renewable energy
Explain why we need to conserve energy
Suggest ways to use energy efficiently
6.2 Renewable and Non-renewable Energy
Renewable & Non-renewable
RENEWABLE ENERGY
Energy that can be replaced when they have been used. MEANS : the supply of these energy sources will not be used up
NON-RENEWABLE ENERGYEnergy that cannot be replaced and will finally be used up.
ENERGY SOURCES ON EARTH
RENEWABLE NON - RENEWABLE
• Wind
•Geothermal
•Sun
•Waves
•Biomass
•Water
•Petroleum
•Natural gas
•Coal
•Plutonium
•Uranium
Fossil Fuel
Radioactive
metals
Non-renewable energy
Coals, petroleum, natural gas are examples of
fossil fuels.
They are formed from dead animals and plants
which died millions of years ago.
fossil fuels are considered non-renewable
because they take so long to form and therefore
cannot be replaced.
Fossil Fuels
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