2. 6HYQ-9357-UFY9-9UFC-ERLD

4. Contents
 Definition of energy
 Sources of energy
 Why use of fossil fuel?
 Why is there a need for alternative sources of energy?
 Alternative source of energy
 Renewable sources of energy
 Biomass
 Hydropower
 Geothermal heat & power
 Sunlight , Wind , Rain , Tides
 Advantages of using natural sources of energy
 References

6. Definition of energy
Energy can b define in different manners some of them
are as follows
 Energy cannot be created nor destroyed .
 Energy is the ability to do work.
 The capacity for vigorous activity .
 An adequate or abundant amount of such power
.

7. Sources of energy
sources of energy are divided in two parts.
Non renewable sources Renewable sources
 A non-renewable resource is a  Renewable source - Renewable source
natural resource which cannot be is natural source which does not have a
produced, grown, generated, or used on limited supply. Renewable energy can be
a scale which can sustain its used again and again, and will never run
consumption rate, once depleted there out.
is no more available for future needs. Examples
Also considered non-renewable are  Biomass
resources that are consumed much
 Hydro
faster than nature can create them.
 Geothermal
 Examples
 Solar
• Fossil fuels (such as coal, petroleum, and
natural gas)  Tidal
• nuclear power (uranium)  Wave
• aquifers are examples. In contrast,  Wind
resources such as timber (when
harvested sustainably) or metals (which
can be recycled) .

8. Why use of fossil fuel?
 Very high calorific value
 Easy to locate with advance technology.
 Coal is a fossil fuel that is found in abundance.
 Transportation of fossil fuels are easy.
 Construction of power plants that work on fossil fuels is
also easy.
 Petroleum is the most used form of fossil fuels for all types
of vehicles.
 Extraction is easy with cheap cost

9. Why is there a need for alternative
sources of energy?
 90 per cent of the worlds energy supply’s come from fossil
fuels.
 Stopping of fossil fuels becoming rare.
 Burning fossil fuels has increased atmospheric pollution.
 Vehicle exhausts contribute to acid rain more so than
power stations burning coal.
 The carbon stored in fossil fuels is released as carbon
dioxide when they are burnt – this leads to the green
house effect and global warming
 Don’t get this confused with the hole in the ozone layer –
this was caused by CFC’s

11. Alternative source of energy
Definition
• An energy source that can be used instead of
fossil fuels .
It is usually a renewable source of energy that
could be used when fossil fuels run out.

12. Renewable sources of energy
Some of renewable(alternate) sources of energy are:
 Sunlight
 Wind
 Rain
 Tides
 Geothermal heat
 Hydro
 Biomass

13. Biomass
Biomass, as a renewable energy source, is biological
material from living, or recently living organisms. As
an energy source, biomass can either be used directly,
or converted into other energy products such
as biofuel.
Biomass gasification.
Biomass heating system.
Biomass fuel.

14. Hydropower
 Hydropower, or water power is power that is
derived from the force or energy of falling water,
which may be harnessed for useful purposes.
 Generation of electricity.
 Generation on large scale.
 Cost of generation will b low.

15. Geothermal heat & power
 Geothermal energy originates from the heat
retained within the Earth since the original
formation of the planet, from radioactive decay of
minerals, and from solar energy absorbed at the
surface.
 Geothermal heat is used for heating application.
Geothermal power is used to generate electricity.

16. Sunlight , Wind , Rain , Tides
 These are the major alternate sources of energy.
 With the help of al these we can generate electricity by
using solar system , generators, and by dams.
 We can also generate heat by sunlight by using heating
system and can also generate any type of mechanical
energy with these sources.

17. Advantages of using natural
sources of energy
 They are inexhaustible – they will always be available
– they are renewable
 They are clean and will not damage the Earth
 There are several types – so one or more of them is
present in each country
 Most natural sources can be used on a small scale and
serve local needs therefore cutting costs of
transmitting the energy
 It just require a one time big investment.

19. References
 http://www.wri.org
 http://www.google.com.pk
 www.ecology.com/2011
 energy.usgs.gov/