Subject: Physics
The wind possesses kinetic energy. The kinetic energy of the wind is known as wind energy.
The kinetic energy of the wind can be used to
A device used to convert wind energy into the mechanical energy of the machine is called windmill.
It consists of a wheel rotates about an axle mounted on a pole. The wind energy is used to rotate the wheel about its axis.
Uses
The axle of the windmill is connected to a crank rod. The free end of the water pump rod or piston is connected to U-bend of the crank rod.
Working: When the wind strikes the blades of the windmill, the kinetic energy of the wind is used to rotate the wheel of the windmill. As a result, the axle or shaft attached to the wheel rotates which turns the crank rod. The u-bend of the crank rod produces up and down motion of the piston of the water pump. Hence, the underground water is drawn to the surface of the earth.
When the armature of a generator rotates between two poles of the strong magnet, then electricity is produced. Windmill rotates when the wind falls on the wheel of a windmill. So the armature of the generators rotates between two poles of a magnet along with the rotation of the wheel of the wind. Electric current is produced. This is how, the kinetic energy of the wind is converted into electric energy.
Advantages
During photosynthesis process, solar energy is converted into chemical energy. So, plants have stored chemical energy in the forms of biomass. The matter contained in the body of different plants and animal have biomass. The gas obtained from biomass is called biogas.
Biogas is a mixture of various gases formed when the animal dung is mixed with water and ferment in the absence of air.
The arrangement of producing biogas from animal dung, human excreta, industrial and domestic wastes is known as biogas plant. The arrangement of producing biogas from animal dung, human excreta, industrial and domestic wastes is known as biogas plant. A biogas plant consists of a well shaped, underground tank T called digester, which is made of bricks, and has a dome-shaped roof D. The digester is a kind of sealed tank in which there is no oxygen which acts as a gas-holder for the biogas. On the left side of the digester tank is sloping inlet chamber I and on the right side is a rectangular outlet chamber O, both made of bricks. The inlet chamber is for introducing fresh dung slurry into the main digester tank whereas outlet chamber is for taking out the spent dung slurry after the extraction of biogas. The inlet chamber is connected to a mixing tank M while outlet chamber is connected to the overflow of tank F. There is a gas out let S at the top of the dome having a value V.
Working
Cow-dung and water are mixed in equal proportions in the mixing tank M to prepare the slurry. This slurry of dung and water is fed into the digester tank T through the inlet chamber I. the digester tank is filled with dung slurry up to cylindrical level, the dome being left free for the collection of biogas. It might take 50 to 60 days for the new-gas plant to become operative. Gradually when the biogas starts collecting in the dome, it exerts pressure on the slurry in the digester tank and forces the spent slurry to go into overflow tank F, through the outlet chamber O. the spent slurry is gradually removed by the overflow of the tank. The spent dung slurry left after the extraction of biogas is rich in iron and phosphorous compounds and forms good manure.
Advantages
Reference
Manu Kumar Khatry, Manoj Kumar Thapa, et al.Principle of Physics. Kathmandu: Ayam publication PVT LTD, 2010.
S.K. Gautam, J.M. Pradhan. A text Book of Physics. Kathmandu: Surya Publication, 2003.
The kinetic energy of the wind is known as wind energy.
A device used to convert wind energy into the mechanical energy of the machine is called windmill.
Biogas is a mixture of various gases formed when the animal dung is mixed with water and ferment in the absence of air.
The arrangement of producing biogas from animal dung, human excreta, industrial and domestic wastes is known as biogas plant.
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