SOURCES OF ENERGY
Sources of energy:Sources of energy is required to do the work.
Energy can be transformed from
One form to another.
SOLAR ENERGY > CHEMICAL ENERGYPHOTOSYNTHESIS
MUSCULAR ENERGY > SOUND ENERGY
SOUND ENERGY > ELECTRICAL ENERGY
FOSSIL FUEL
Fossil fuel are formed due to dead animals and plants.
Due to the tremendous heat and pressure, Fossil fuels are formed.
Fossil fuel
Solid liquid gaseous
SOLID - COAL1 kg wood = 1700 kilo jocks energy
LIQUID – PETROLFound under 25,000 m below earth bowls.
GASEOUS – METHANE , ETHAVEConvenient to use (portable)
SOLAR ENERGY
Non – conventional source.
Not causes pollution.Easily available and free of cost.
Some devices work by solar energy.
Solar cooker
Solar cells
solar lantern
Solar heater
similar examples of non – conventional sources.
Wind energy
Tidal energy
Hydroelectric energy
BIOGAS
Conventional sources:Are not easily available.Creates danger of global warming.
creates pollution.
conventional sources can cause :
Acid rain
Ultravoilet rays
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Affect crops
Atomic energy:Atomic energy is obtained when uranium atoms are bombared with neutrons.
Some atomic power plantIn india.
BENGAL
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maharashtra
gujrat
REVIEWING THE LESSON
Those substance that gives out energy when the are burn are called fuels.
Coals, mineral oils and natural gas are fossil fuels.
Deposits of fuels are limited.
ThankYou.
Made By : vedant tiwariSTD/DIV: viii/aRoll No: 53School:St. xavier’s high school (kashigaon)