18-12-2012, 06:51 PM
SOURCES OF ENERGY
SOURCES OF ENERGY.ppt (Size: 1,007.5 KB / Downloads: 222)
Characteristics of a good source of fuel :-
i) It should have a high energy output per unit mass or volume.
ii) It should be easily available.
iii) It should be easy to store and transport.
iv) It should be economical.
2) Sources of energy :-
There are two main sources of energy. They are conventional and non conventional sources of energy.
i) Conventional sources of energy :- are wood, flowing water and fossil fuels (coal, petroleum, natural gas).
ii) Non conventional sources of energy :- are solar energy, wind energy, biomass energy, ocean energy (tidal energy, wave energy, ocean thermal energy), geothermal energy, nuclear energy etc.
Some sources of energy are renewable like sun, wind, flowing water, ocean, wood, biomass etc.
Some sources of energy are non renewable like coal, petroleum and natural gas.
Conventional sources of energy :-
Fossil fuels :- are fuels formed inside the earth from the
remains of plants and animals after millions of years. The
fossil fuels are coal, petroleum and natural gas. Fossil
fuels are non renewable sources of energy so they
should be conserved and used judiciously.
Disadvantages of fossil fuels :-
i) Burning of fossil fuels release gases and harmful
particles which causes air pollution.
ii) Burning of fossil fuels release acidic oxides of sulphur
and nitrogen which causes acid rain which is harmful for
living organisms, affects soil and water, causes damage
to buildings, corrosion of metals etc.
iii) Burning of fossil fuels release a large amount of carbon
dioxide gas which increases the temperature of the
atmosphere and causes global warming (green house
effect).