This pre

1. Topic :
Energy Resources
Designed by Pronoy Roy
LPU , Jalandhar, Punjab

2. The substances from which we produce energy are known as
energy sources. We need energy for our day to day life. The
energy we use are of two broad categories:
1. Renewable source of energy
2. Non-renewable source of energy

3. Fossil fuels constitute most of the energy we use. Only 16.7% of the total energy is renewable energy. The main
constituent of renewable power source is biomass heat , which constitute 11.44% of the total energy produced
world wide. After that, there is hydro power , which constitute 3.34% of the total power produced worldwide.

4. The sources of energy that once used , cannot be reused are known as
non-renewable sources of energy. These are the energy sources which are mined
from the earth crust. These sources of energy are known as fossil fuels and these
took millions of years to form and cannot be regenerated in a matter of years. The
rate of consumption far exceeds the rate of production of these resources.
These include:
 Coal
 Petroleum
 Natural gas
 Nuclear fuel

5.  Once used , these fossil fuels are not regenerated in a matter of years.
The take millions of years to form.
 Fossil fuels such as coal and petroleum causes a huge amount of
pollution by emitting tons of polluting gases, when combusted. These
gases are the main cause of global warming.
 These energy sources are being exploited at a very fast rate. At this
rate, the future generations will not be left with any power source.

6. The virtually unlimited sources of energy which will not be exhausted in any near
future are known as the renewable sources of energy. These energy sources are
continuously replenished at a constant rate. About 16.7% of global final energy
consumption comes from renewable energy sources.
The renewable sources of energy include:
 Solar power
 Hydel power
 Wind energy
 Tidal energy
 Geothermal energy
 Biogas

7. Solar power is the power derived from the rays of the sun. Solar power can be
used in two ways: direct and indirect.
In the direct way, sunlight is used to warm water or can be used to cook food
using a solar cooker.
In the indirect way, sunlight is made incident on solar cells or photo-voltaic
cells . Electricity is generated in the circuit which is used to charge batteries.
The power stored can be used at any later time.
Limitations:
 Sunlight is not available throughout the year. There are cloudy days as well.
 The cost of solar cells is very high. The preliminary cost is high but after
setting up, electricity is generated for free.
 Efficiency maximum efficiency of solar cells till date is only 44%.

8. A solar powered street signalling device outside LPU.

9. Hydel power is the energy generated by rotating
turbine by the flow of water. Water is collected behind
a dam and then the water is allowed to flow to low
potential , by turning a turbine. It is a clean source of
power.
Limitations:
Hydel power requires quick flowing rivers which flow
from a higher to a lower position.
Construction of dams require huge sum of money and
it also drowns a significant amount of flora and fauna.

10. Wind Energy
In regions of fast flowing winds, wind
turbines are set up , and the wind flow is
used to turn turbines which in turn
generates electricity. Globally wind
energy contributes 0.51% to the global
power generation.
Limitations:
 Wind farms require huge amount of
unobstructed land.
 The wind flow should remain constant
throughout the year, not seasonal.

11. It is the energy obtained from the
Earth’s crust . Where there is magma
near the surface, cold water is sent
through a shaft to the heated rocks and
through another shaft, steam is
extracted which is used to turn turbines
to generate electricity.
Limitations:
 Geothermal energy can only be used
where the magma layer is near the
surface of the surface.

12. Conclusion
 Use of fossil fuels should be reduced to quite some extent.
 The renewable sources of energy should be modified to give the maximum
output.
 Improvement of engines should be encouraged so that minimum resources are
required for energy production . The engines should be made more efficient.
And last but not the least……
 Save electricity and fuel for the future.

13. End Of Show……..
Thank You……