This is a presentation on a chapter of class 10th...

1. SOURCES OF ENERGY
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We use energy every day. Energy is need to operate
machines, to heat and cool our homes and schools, to
cook, to provide light and to take people from place to
place.

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THE SUN
Almost all of the energy we use comes
from the sun.
The sun is like a giant energy factory.
The easiest way to get energy from the
sun is to use its light.

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SOLAR ENERGY
Solar energy is used to perform small
jobs.
People catch energy from the sun by
using solar cells.

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Solar panels are used to
collect energy from the sun.

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Fossil Fuels
Coal, oil and natural gas are fossil fuels.
Fossil fuels are formed in the earth from
plants and animals that died millions of years
ago.
Fossil fuels are a nonrenewable form of
energy. That means that they can not be
replaced once they are used.

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COAL
Coal is an important fossil fuel.
Coal is found underground.
Coal is used to make electric power.
When coal is burned, it pollutes the air.

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This coal is being carried from a coal
mine in a box car.

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OIL
Oil is removed from deep within the
Earth. Workers pump oil out of the
Earth using wells.
Oil is used to make gasoline and
heating fuel.

10. Oil is being removed from the
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Earth with a drill.

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NATURAL GAS
Natural gas comes from the Earth.
Natural gas is a clean source of energy.
Natural gas can be compressed into a
liquid and moved long distances
through pipelines.

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These pipes carry natural
gas.

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Other Forms of Energy
Energy from water is called
Hydropower.
Falling or moving water can be used to
create energy.

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Dams are used to create
Hydropower.

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WIND POWER
Wind power turns windmills and moves
sailboats.

16. Windmills have been used for
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hundreds of years to grind
grain and pump water.

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CONSERVATION
Since fossil fuels are a nonrenewable source
of energy, it is important that we conserve
energy.
We can conserve energy by turning off lights
when they are not being used, walk instead of
drive if we are going short distances and
wear layers of clothes to keep warm.

18. Thank You
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