3. Energy:
Energy is the ability to do work, to
make things happen, and to cause
changes.
Energy cannot be made or
destroyed; it can only be changed
into different forms.
4. There are two categories of
energy..
Renewable:
Energy sources that
are replaced naturally
Non-Renewable:
Energy sources that are
limited and will end
7. Fossil Fuels
A fuel (as coal, oil, or natural gas)
formed in the Earth from plant or
animal remains
8. Fossil Fuels
Advantages:
It is an easy and a
regular way of
producing energy.
It is not so expensive
to build power plants.
Disadvantages:
They will run out one
day.
It pollutes a lot; it
emits greenhouse
gases, acid rain and
it pollutes rivers and
lakes.
9. Nuclear
Nuclear energy is energy that is stored within
the nucleus of atoms. The only way for this
energy to be released is through the splitting
of or joining of atomic nuclei.
10. Nuclear Energy
Advantages:
It produces a great
amount of energy
It doesn’t produce
acid rain or
greenhouse gases
Disadvantages:
It can cause serious
damage and
accidents
It’s very difficult and
dangerous to keep
radioactive waste
It’s expensive
13. Hydraulic
Advantages:
It’s free
It’s easy to keep
It’s clean
The reservoirs
regulate the flow of
the rivers
Disadvantages:
It’s expensive
The water supply is
irregular
The reservoirs change
the environment
Heat waves can cause
a smaller amount of
this energy
14. Wind
The energy from wind can be captured to
generate electricity. We use windmills to do
this.
15. Wind
Advantages:
It’s free and clean
It won’t run out
There are little safety
risks with wind turbines
It’s a quick way of
producing mechanical
energy
Disadvantages:
The power of
generators are very
expensive
It’s production is not
regular
It’s very noisy and
does not look nice in
nature
17. Solar
Advantages:
it’s free
It’s clean
The sun will always
be there during our
lifetime so it won’t
run out
Disadvantages:
A great amount of
land is needed
It’s expensive
It’s production is not
always happening
Bad impact on the
environment
18. Biomass
Biomass is any material from plants or
animals that we can convert into energy.
Examples are wood, corn, manure or
garbage. Most commonly, we burn these
materials to make energy.
19. Biomass
Advantages:
It reduces waste
It creates little
rubbish
Disadvantages:
It pollutes since it
produces CO2
It’s limited
It takes a long time
to be created
Many trees are cut
down
20. Geothermal
"Geo" means "from the
earth," and "thermal"
means "heat," so this
type of energy is found
under the earth. The hot
lava from a volcano and
the hot steam from a
geyser both come from
underground heat and
we can use that same
type of heat in our
homes.
21. Geothermal
Advantages:
It’s clean, it doesn’t
produce big amounts
of waste
It’s quite regular
It’s endless
Disadvantages:
We need advanced
and very expensive
technology
It’s expensive
It deteriorates the
landscape and the
ecosystem
It cannot be
transported
22. Solid Urban Waste
Energy can be gathered from waste (trash or
rubbish) by burning it or changing it to
methane gas
23. Solid Urban Waste
Advantages:
It reduces waste
Disadvantages:
It pollutes
It generates
poisonous/toxic
products and
releases heavy
metals
24. Tidal Energy
Energy produced by the
tides of the ocean. Tides
are produced by the pull
of gravity from the Moon
as well as the spin of the
Earth. There is a lot of
energy in the movement
of that much water.
25. Tidal Energy
Advantages:
Tides are free and
will not run out
It doesn’t pollute
It’s noiseless – it is a
quiet type of energy
Disadvantages:
It had a negative
impact on the
landscape, flora and
fauna
26. Wave Energy
Energy gotten from
the waves of the
ocean. Waves are
formed by wind
moving across the
surface of the ocean.
A large amount of
energy is stored in
waves.
27. Wave Energy
Advantages:
It’s clean and free.
Wave power does
not produce
greenhouse gases.
Disadvantages:
The facilities and
equipment are very
expensive.
Electricity production
depends on the wave
speed, height and
length.
29. Energy Conservation
By using less energy
Turning off water when we don’t need it
Unplugging electronics
Not leaving the lights on
Shorter showers
30. Energy Efficiency
We talk about energy efficiency when we try
to reduce the amount of energy required to
provide the same products and services.
Using a washing machine that saves energy
31. Recycling
This involves the use of waste or old materials
to make new ones. The energy needed to
recycle many materials is less than the
energy required to make it from scratch.
