Introduction of Solar Energy
We are like tenant farmers chopping down the fence around our house for fuel when we should be using Natures inexhaustible sources of energy–sun, wind and tide… I’d put my money on the sun and the solar energy. What a source of power! I hope we don’t have to wait until oil and coal run out before we tackle that–Thomas Alva Edison
What an advanced scientist he was! Certainly, sunrise and sunset are one of the most beautiful scenes you have ever seen with your beautiful eyes, and I bet you will never get bored seeing these over and over every day at dawn and dusk. The sun is now beyond beauty because the scientists have exploited the invisible sunlight to create a dependable alternative energy source “Solar energy” to serve the human kind, and give them a better world to live in.
“Green world” is now like a buzzword in today’s world. We are now very concerned about our future. Renewable energy like Solar energy, Hydro power, Wind power, Geo thermal, Biomass, and Tidal are the God gifted resources, and by utilizing them we can lead us to a green world.
For a layman, solar energy can be labeled as “Solar energy is the energy produced by the sun in the form of light.” But if you want to get into deeper, then for your better understanding the explanation would be like this–“There is continuous reaction going on in the sun; this reaction is called fusion (joining two small atoms to make a big atom); in the sun two Hydrogen atoms join together and makes a new Helium atom, but during the conversion process the weight of Helium is found somewhat less than the Hydrogen; this lost matter is the energy which comes to the Earth through electromagnetic wave, and we all call it sunlight.” According to the scientists, every second 600 million tons of Hydrogen is being converted to Helium, and 89000 terawatts of energy eventually comes to the Earth’s surface. This is 59000 times more than our consumption which is 15 terawatts. So, all we need to do is to harness this radiant energy as much as possible.
The best known way to harness this energy so far is the Photovoltaic (PV) cells. The science behind the phenomenon of harnessing electricity from the sunlight is called photoelectric effect which was discovered in 1839 by a French physicist named Edmond Becquerel, and later Sir Albert Einstein got a Nobel Prize for explaining the photoelectric effect in 1905. In fact, photoelectric effect is not a tough term to understand. Material like Silicon shows the photoelectric effect. When sunlight containing photons strike the surface of a solar panel which is made of especially treated Silicon, the electrons of Silicon is released; this is the photoelectric effect, and we all know that electricity is nothing but a flow of electrons.
Some PV cells make a PV module. The first PV module was invented by Bell Laboratories (present name Lucent) in 1954, but it was too expensive to use in a large extent because it had poor efficiency. MIT did research on solar energy in 1930s, 40s and 50s and it became commercially successful. Later on spacecraft used solar power; they improved the technology, and finally now we have 100 times less cost than 1970s.
Today, solar power is very popular all over the world. It is considered a probable solution to the green world. You could also take part in the campaign by using solar energy. We all should be kind to the planet Earth as much as possible.
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