This presentation is a brief description about various sources of energy like solar, wind, hydro and bio energy.

2. Renewable energy is natural energy which does
not have a limited supply and can be used again and
again and will never run out.
Renewable resources can be replaced and they are
different from non-renewable resources like fossil
fuels that are gone.

3. According to the National
Renewable Energy Laboratory,
using renewable resources can
save money while creating a clean
energy future. As fossil fuels
become less available,
researchers are turning to
renewable energy sources to
replace them.

4. Solar Energy
Wind Energy
Hydro Energy
Bio Energy

6. Solar Energy originates with the thermonuclear fusion
reactions occurring in the sun. It represents
the entire Electromagnetic radiation.

7. Solar Energy can be
used directly for
heating and lighting
homes and other
buildings, for generating
electricity and for hot
water heating and solar
cooking.

8. The surface receives about 47% of the total solar
energy that reaches the Earth. Only this amount is
usable.

9. Solar panels consist of a
series of solar cells that
convert light from the sun
into DC electricity. It is
used because it is more cost
effective than extending
power lines.

10. All chemical and radioactive polluting byproducts
of the thermonuclear reactions remain behind on the
sun, while only pure radiant energy reaches the
Earth.

12. Wind energy is the fastest growing renewable
resource. They are influenced by
the ground surface
at altitudes up to 100 meters and is slowed by the
surface roughness and obstacles.

13. A Windmill captures
wind energy and then uses
a generator to convert it
to electrical energy.

14. Wind turbines are used to
produce serious amounts of
electricity.
It is of two types :-
1. Large Turbine
2. Small Turbine

15. Able to deliver electricity
at lower cost than smaller
turbines, because
foundation costs, planning
costs, etc. are
independent of size.

16. Local electrical grids may
not be able to handle the
large electrical output
from a large turbine, so
smaller turbines may be
more suitable.

17. Wind Turbine generators
convert wind energy into
electrical energy.
The generator is
attached at one end to the
wind turbine and at the
other end, it is connected
to the electrical grid.

18. Wind energy is a domestic, renewable source of
energy that generates no pollution and has little
environmental impact.
The wind blows day and night, which allows wind-
mills to produce electricity throughout the day.

20. Flowing water creates energy that can be captured
and turned into electricity. This is called
Hydroelectric power or Hydro Power. It is an
environmentally friendly way to generate electricity.

21. The most common type of hydro-
electric power plant uses a dam
on a river to store water in a
reservoir. Water released
from the reservoir flows through
a turbine, spinning it, which in
turn activates a generator to
produce electricity. But some
hydroelectric power plant just
use a small canal to channel the
river water through a turbine.

22. A dam is built to trap water,
usually in a valley where there is
an existing lake. Water is allowed
to flow through tunnels into the
dam, to turn turbines and thus
drive generators. Notice that the
dam is much thicker at the
bottom than at the top, because
the pressure of the water
increases with depth.

23. Once the dam is built, the energy is virtually
free.
No waste or pollution is produced.
Electricity can be generated constantly.
Much more reliable than wind, solar or wave
power.

25. Along with the rain and snow, sunlight causes plants
to
grow. The organic matter that makes up those plant
is known as biomass. Biomass can be used to produce
electricity, transportation fuels or chemicals. The
use of biomass for any of these purposes is called
Bioenergy.

26. Biogas typically refers to a gas
produced by the biological
breakdown of organic matter in the
absence of oxygen. Organic waste
such as animal dung, kitchen
waste etc. can be converted into a
gaseous fuel called biogas. Biogas
originates from biogenic material
and is a type of Biofuel.

27. Biogas is produced by anaerobic
digestion or fermentation of
Biodegradable materials such as
biomass, manure, sewage,
green waste, plant material and
crops. Biogas comprises primarily
methane and carbon dioxide and
may have small amounts of
hydrogen sulphide and moisture.

28. It helps in saving Fossil fuels and also saves money
as well as cooking time.
Improves hygienic conditions and rural standard of
living.
Reduces air and water pollution.
It can be utilized for electricity production on
sewage works.