1. Topic - 10 Sources of energy Topic-Sources of energy
Sub-Science
Std-8th
Topic - 10 Sources of energy
Std-8th
Sub-Science
Topic-Sources of energy

2. Topic-Sources of energy
Introduction
10.1Fossil fuel
10.2 Forms of fossil fuel
10.3 Sun
10.4 Solar cooker & Solar heater
10.5The solar cell
10.6 Other sources of energy
10.7Atomic energy
Std-8th
Sub-Science
Topic-Sources of energy

3. Topic-Sources of energy
The capacity to do work is called energy Although energy has many forms ,it can be changed from one form into another.
Std-8th
Sub-Science
Topic-Sources of energy

4. A substance that produced energy on burning is called fuel.
Std-8th
Sub-Science
Topic-Sources of energy

5. Topic-Sources of energy
FOSSIL FUEL
A lakes of years ago because of different calamities ,remnants of plants and animals got buried into the earth. Due to effect of the tremendous pressure of layer of the earth above the heat inside they were converted into fuel. Such fuels are called fossil fuel
Std-8th
Sub-Science
Topic-Sources of energy

6. Topic-Sources of energy
Forms of fossil fuel-
Fossil Fuel
Solid
Liquid
Gaseous
Std-8th
Sub-Science
Topic-Sources of energy

7. 1.SOLID It was made from remains of plants. Firewood and brushwood
are used in rural areas.
Charcoal is formed when
wood is burnt in insufficient
air. Charcoal burns smoke
less.
Std-8th
Sub-Science
Topic-Sources of energy

8. 2.LIQUID
Mineral oil is found nearly 25,000 meters deep in the bowels of the earth.
Petrol, diesel, kerosene and fuel oil can be obtained from it .
70 percent mineral oil we use.
Std-8th
Sub-Science
Topic-Sources of energy

9. Topic-Sources of energy
3. GASEOUS
Natural gas is lights up quickly and burns without leaving behind any solid substances. Besides, it is easy to transport form its main source by means of pipes over long distances. A big advantage is that the burning of natural gas can be easily controlled.
Ex. methane [CH4], ethane[C2H6], propane[C3H8], butane[C4H10], etc.
Std-8th
Sub-Science
Topic-Sources of energy

10. Topic-Sources of energy
Sun
The earth gets a tremendous amount of energy from the sun as much as 7 x 1017 kilowatts per year.
Std-8th
Sub-Science
Topic-Sources of energy

11. Topic-Sources of energy
Solar Cooker
Std-8th
Sub-Science
Topic-Sources of energy

12. Topic-Sources of energy
Solar Heater
Std-8th
Sub-Science
Topic-Sources of energy

13. Solar cooker and solar heater Topic-Sources of energy
In this devices, mirrors are used to collect and concentrate solar energy.
It can be used to cook food or heat water, etc.
Std-8th
Sub-Science
Topic-Sources of energy

14. Topic-Sources of energy
Solar Cell
Std-8th
Sub-Science
Topic-Sources of energy

15. Topic-Sources of energy
Solar cell
In the solar cell, solar energy is converted into electric energy and this can be used at night for lighting.
Std-8th
Sub-Science
Topic-Sources of energy

16. Topic-Sources of energy
Fossil fuel
They cannot be produced a new, therefore, they are called to be conventional or non- renewable sources of energy.
There are only limited deposits of fossil fuel.
Std-8th
Sub-Science
Topic-Sources of energy

17. Topic-Sources of energy
Solar energy
It is always available, so they are called non-conventional or renewable source of energy.
Std-8th
Sub-Science
Topic-Sources of energy

18. Other sources of energy
Wind energy, hydro- electric energy, biogas, bio-diesel
Std-8th
Sub-Science
Topic-Sources of energy

19. Topic-Sources of energy
Wind
Energy
Std-8th
Sub-Science
Topic-Sources of energy

20. Topic-Sources of energy
Biogas
Std-8th
Sub-Science
Topic-Sources of energy

21. Problem created by using conventional sources of energy
Global warming – Gases like carbon-dioxide, carbon-monoxide, hydrogen sulphide causes problem of population.
Pollution – Carbon-dioxide and many other gases causes problem of pollution.
Deplenation of ozone layer- gases like CFC causes holes in ozone layer of atmosphere.
Deforestation-Due to cutting trees causes number of forest become dwindled.
Std-8th
Sub-Science
Topic-Sources of energy

22. Topic-Sources of energy
Atomic energy
Std-8th
Sub-Science
Topic-Sources of energy

23. Questaion 1 What is mean by Fuel 3 Name of the solar apparatas
2 Name the different types of fossil fuels.
3 Name of the solar apparatas
4 What is mean by Enerngy

24. Name - Mrs.Patil shashikala Chandrakant
School Name :-Chh.shivaji vidyalay ,palaspe
tel:Panvel Dist :- Raigad
Std ;-8th sub -Science