Laser ,Types and Use

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  LASER :-                    LASER is an acronym of  Light Amplification by stimulated emission of Radiation. It is an optical device which produces an intensive beam of highly coherent, Monochromatic light[ Electromagnetic radiation, especially visible radiation, of only one frequency or wavelength]. It can travel over great distance without spread.   LASER LIGHT :-                                   1. It is very different than normal light and contains only one specific wavelength of light.                                 2. A laser light has very tight beam and is very strong and concentrated.                                 3. A laser light can go to the moon and th...
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Wind Mill, wind generator and Wind energy farm advantages and limitations

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What is Wind Mill?
              - It is a machine which works with the energy of blowing air or wind. It is the structure similar to a late electric fan that is erected at some height on a rigid support.

Principle of Windmill- When the blowing air or wind strike across the blade of a windmill, it exerts a force on them due to which blade of the windmill start rotating. This rotational motion of the blade can be used to drive a large number of machines like water pumps, flour mills and electric generator.

 Wind Generator- Windmill used for generating electricity is called wind Turbine and the complete setup of generating electricity by using wind energy is called a wind generator. The end rotates the blade of the wind turbine which in turn rotates the armature or coil of a small electric generator to produce electricity.

 [Denmark is called the country of winds. More than 25% of their electricity needs are generated through a vast network of windmills. In terms of the total output, Germany is the leader, While India is ranked 5th in harnessing wind energy for the electricity and the USA generated 11.4% of its total.]

 Wind Energy Farm - For commercial purposes, a number of windmills are erected over a large area known as wind energy farm. It is estimated that nearly 45,000 MW of electrical power can be generated.
Advantages-
1. It is an environment-friendly and efficient source of renewable energy.
2. It does not recurring expenses for the production of the electricity.
Limitations-
1. It can be established only at those places where the wind blows most of the part of the year.
2. The minimum wind speed necessary for the satisfactory working of a wind generator is 15km/hr, that is not always so. 
3. Wind energy requires quite a large area of land nearly 2-hectare land is needed for 1MW generator.
4. The setting up of wind energy farm is very expensive.
5. Wind energy farms disturb the rainfall pattern. 
6. Wind energy farms need high level of maintenance.


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