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Can You Write A Note On Solar Energy?

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shahid tauqeer Profile
shahid tauqeer answered
The earth receives huge amount of energy directly from the sun each day. Solar energy at normal incidence outside the earth's atmosphere is about 1.4 kwm which is referred as solar constant. While passing through the atmosphere, the total energy is reduced due to reflection, scattering and absorption by dust particles, water vapors and other gases0 on a clear day at noon, the intensity of the solar energy reaching the earth's surface is about 1kwm.

This energy can be used directly to heat water using large solar reflectors and thermal absorbers or be converted into electricity. Much higher temperature can be achieved by concentrating solar radiations on to a small surface area by using huge reflectors or lenses to produced steam for running a turbine. The other method is direct conversion of sunlight into electricity through the use of semiconductor devices called solar cells also known as photo voltaic cells. Solar cells are thin wafers made from silicon. Electrons in the silicon gain energy from sunlight to create a voltage. The voltage produced by a single voltaic cell is very low. In order to get sufficient high voltage for practical use, a large number of such cells are connected in series forming a solar panel. Solar calculators are also in use now a day.
Afzaal Ahmad Profile
Afzaal Ahmad answered
Solar energy is most important form of energy in future because the present energy sources used by whole world are decreasing rapidly. The most commonly used energy source is oil. Oil is used in auto mobiles and industry in a heavy quantity. Then natural gas is used as an energy source. But both of them are vanishing rapidly from earth because of excessive use. Due to their excessive consumption, it is needed to find another source which can be used for centuries. Solar energy is very useful and also it is friend of weather because it does not produce and kind of pollution.

To capture solar energy, a special plate is used which is called solar cell, solar cell is kept in the direct light of sun, when light falls on solar cell, cell generates energy and transfer to battery attached with it and this is how energy is stored with help or solar cell. The most important benefit of solar energy is that it does not produce any kind of pollution. It can be said that solar energy is environment friendly. Solar energy can be used anywhere as a substitute of any other energy. A car is invented which uses solar energy to power its engine.

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