Sources of energy

1. Sources of energy

2. Natural resource
Obtained from the environment.
Used without much modification.

3. Sources of energy
Renewable sources Non-renewable sources

4. 1 Renewable sources
Present unlimited in nature.
Inexhaustible.
Can be replenished easily.
Also called as non conventional source.
Utilization is more difficult.

5. Renewable sources

6. 2 Non - renewable sources
Present limited in nature.
exhaustible.
Can not be replenished easily.
Over use of these should be avoided.

7. Non - Renewable sources

8. Fossil fuels
Produces large amount of heat.
Cannot be made by humans.
Important source.
Formed by buried remains.

9. Produces large amount of heat.
Cannot be made by humans.
Important source.
Formed by buried remains of plants and animals.
Takes almost million of years to form again.
Ex: coal, petroleum, natural gas etc..

10. Coal

11. Uses of coal
It is used in solid, liquid and gaseous state

12. Solid state
Coke
Smokeless.
Pure form of carbon.
Contains 98% of carbon.
Mainly used for ironing ad barbeque.

13. Liquid state
Coal
tar
Mainly used to make coal tar pitch.
Unpleasant smell.
More than 200 mixture of carbon
compounds.
Used to make dyes, paints,
explosives, perfumes, varnishes etc..

14. Gaseous state
Coal
gas
Coal gas catches fire very easily.
Produces large amount of heat.
Mainly used as cooking gas and as
fuels In industries

15. Coal gas comprises of
 Hydrogen (H)
 Methane (CH4)
 Carbon monoxide (CO)