This document summarizes different sources of energy. It discusses renewable sources like sunlight, wind, bioenergy and flowing water which can be obtained continuously. Non-renewable sources like fossil fuels take a long time to produce and include coal, chemicals and petroleum. Examples are given of how different energy sources like wind, sunlight, biomass and flowing water can be used to do work like pumping water, grinding grains, and generating electricity. The sustainable use of energy sources is important as population and technology increases over time.

1. Sources of Energy
Done By : Azra Ajmal

2. What is Energy?
• Ability to do a work or produce a change.
Eg:
Rotation of a fan.
Toy car working on battery
Sound of a ringing bell

3. What do you mean by source of energy?
• Place or substance that provide us with energy
Heat Energy
Cook meals
Boil water
Source - firewood Change produced

4. Types of Energy Sources
Renewable Non
renewable
•Could be obtained
continuously
•Eg: sunlight ,wind
•Takes a long time to
produce the source
•Eg: Fossil Fuel,chemicals

5. Few sources of Energy
Sources of
energy
Fossil
Sun
Bio
Mass
Wind
Flowing
Water
Electricity
Tidal
Geo
Thermal

6. How does Energy help to do a work
Wind Energy Rotating wind propeller
Observation: Wind propeller starts rotating once the wind blows
Conclusion: Wind causes the wind propeller rotate .Thus, wind has the ability to
the work; Therefore wind is a form of energy.

7. Wind
Observation: When setup is kept under wind
1. The turbine rotates
2. Pen also rotates
3. Thread rolls up
4. Box is lifted
Conclusion: Box is lifted due to wind .Thus, Wind has the ability to do a work or
produce change.
Bent bicycle
spoke wire
Pen
Light weight box
Cut metal tin
lid
Metal Lid cut into
turbine shape
Thread

8. Uses Of Wind
•Separating unfilled and half filled rice grains. (Winnowing Paddy)
•Large Wind Mills ; When rotated helps to grind substances .
•Wind mills are also used to pump water.
•Wind mills are used to produce electricity.(In Hambanthota and Puttalam)
How to produce electricity using Wind mill?
RotatingWind mill Generator
Electricity
produced

9. Sun
Energy obtained from sun is called Solar Energy.
Food is also produced as a result of sun. (photosynthesis in plants)
What are the two types of energy obtained from solar power?
•Light Energy
•Heat Energy
Sun is considered to be the biggest natural source of energy in earth.
Heat of a substance is measured by a device called Thermometer.
(Temperature is measured in celcius (
◦
C ) or Fahrenheit (
◦
F) or Kelvin(K).
The standard International Unit (SI unit) used to measure temperature is
Kelvin(K).
Celcius (
◦
C ) is the unit used casually in day today.

10. Metal vessel
with water
under sun
Solar Thermal Box Stove
Cut and fold the cardboard and cover it
with aluminum foil
Solar thermal box
Observation: When metal vessel filled with water is kept under sun it becomes
heated after sometime:
•Aluminium Foil absorbs heat and allows to heat the box.
•Metal vessel also absorbs heat .And makes the water hot.
Conclusion: Water gets heated due to sun .Thus Solar power has the ability to do
work or produce change.

11. Uses of Solar Power
Produce food. (by photosynthesis in green plants).
Drying processes. (drying grains , drying clothes….etc)
 Solar hot water heater in modern house.
Solar panels .(contains solar cells)
- help in gaining electricity.
- gives power to satellites.

12. Uses of Biomass
•Can be used to produce thermal stove.
•Can be used to produce bio gas.
•Can be used to obtain charcoal.
( -Charcoal is considered as a best cleanser)
•Can be used in old method of ironing clothes.
(normally used in small laundry shops)

13. Biomass
What is biomass?
Plant or animal matter that could used as fuel is called biomass.
Firewood
DDried cow dung
Dried coconut huskDried leaves

14. Saw Dust Stove
Metal
tin
Hole forming PVC that
should be removed
Saw dust
mixed with
dust
Observation: When fired at the bottom after the removal of PVC
tube ;We can close it with a metal lid and use it as a stove.
Conclusion: Saw dust is used as a fuel; Thus has the ability of
doing a work or produce a change.

15. Fossil Fuels
What are fossil fuels?
A natural fuel formed by the past of the remains of living organisms.
How are fossil fuels made?
Dead plants and animals buried.
Buried substances are subjected to high pressure and
temperature.(by sun ,rain,thunder,earthquakes,volcanic eruptions)
After more than millions of years
Fossil fuels could be obtained.

16. Steam Engines
Coal is set to burn with boiling water.
Boiling water gives out steam.
Steam is regulated and more water
vapour gets collected in the gear causing
the wheel to rotate.
Observation:
Conclusion: Fossil fuels are making the steam engine
move; Thus fossil fuels have the ability to do a work
or produce a change.

17. Uses of Fossil fuels
•Fossil fuels are used to produce coal, kerosene oil ,and other
petroleum oil.
•Gas cookers use petroleum gas to work
•Coal power plants help to produce electricity.(Norocholai)

18. Geo Thermal Energy
Heat energy obtained from the earth
Certain places in the earth are subjected to high heat
below the earth.We,humans utilize this heat energy.
Heat stable conducting pipes are built below the
earth .
Water sent through the inlet tube gets
heated.
Water vapour comes out of the tube.
Collected Water vapour allows
turbine rotate and produce
electricity.
Generator
Turbine
Heat stable
conducting tube

19. Flowing Water.
Flowing water
•Allows turbine rotate and produce electricity. •Helps to grind.(Water mill)

20. Flowing Water
Model of turbine
Turbine rotates once
water falls on it

21. Hydropower
Water flows faster
Falls onto turbine
and allows it to
rotate
Rotating turbine
makes the
generator
produce
electricity
Observation:
Conclusion: flowing water’s energy helps to
produce electricity.

22. Sea Waves
Flowing air in sea which rotates the turbine ; Thus helps to
produce electricity.
To be use in near future.
An efficient process.

23. Tidal Energy
Effects of sun and moon causes high tidal
wave and low tidal wave.
High tide allows water move into the
tank.
Low tide allows water move out
Both processes produce large energy.
Makes the turbine rotate and produces
electricity.

24. Nuclear Energy
Nuclear energy occurs in sun as well by chemicals like radioactive substances.
Large amount of energy is released during this nuclear reaction as heat.
Heat produced forms steam that rotates the turbine.
This could be used to produce electricity.
Note: Nuclear energy could be harmful .

25. Sustainable use of Energy
Population in the earth increases.
Technology and use of energy increases.
Continuous usage of energy sources slowly decreases the availability of
nonrenewable sources.

26. Thank you