top-rated free essay

essay on oil

By akkyhl Dec 03, 2013 638 Words
How Electricity is Produced From Solar Panels?
The principle used to generate electricity from the solar panels is the same as that used to generate electricity from the chemical reaction using a standard battery. The basic working of solar panels depends on the semi conductor property of silicon. The silicon is a unique substance that has revolutionized the way electronic appliances work. This property is used to generate electricity from the solar panels. In order to understand how solar panels work we need to understand how silicon works at an atomic level. Silicon in its pure form i.e. when all the impurities have been removed a silicon atom is bonded with another silicon atom. Since the valency of silicon atom is 8 which means that there are 8 electrons in its outermost orbit. However in its natural state there are only 4 electrons bounded in the outermost orbit. Hence these 4 electrons are able to bond with another 4 electrons with 4 silicon atoms around it. The 4 free electrons that can move around throughout the substance. During the absence of electric potential these free electrons tend to remain close to their parent atoms so that they are at minimum energy level. However when the electric potential is applied across the substance these free electrons receive energy and move direction of the potential difference applied thus producing electric current. However the current produced in a pure semiconductor is quite less because these free electrons wants to remain at minimum energy level possible. Now let us take an example of a pure silicon semiconductor and introduce a small amount of phosphorus. Now this new atom has five electrons around it. When it bonds with other 4 silicon atoms, its fifth electron is free. But again during the absence of potential difference, the fifth electron is bonded with the phosphorus atom. In presence of potential, these free electrons can move in the direction of the potential difference applied hence generating electric current. This phosphorus atom is negatively charged this makes the silicon/phosphorus plate negatively charged. In the same way when another substance such as boron is introduced in a pure silicon plate, it becomes positively charged. This is because boron has valency 3 and there is one space left in the boron atom which is called “a hole”. Since this plate hence needs an electron and hence it becomes positively charged. These 2 positive and negatively charged plates when combined together can now produce electricity. This is when the sun’s energy comes into picture. The solar radiation coming from the sun is used as a trigger to initiate a flow of electric current from positive plate to the negative plate. Now what exactly in the sun’s radiation causes the electrons to agitate? The substance is photon. When this photon falls on the negative plates of the solar panel it knocks off free electrons on the plate. As this electron is loosely attached to its parent atom is freed it can now move around the plate. However this electron is attracted by the positively charged plate and the electron is bounded again. In the same way when more photons knock off electrons, electricity is generated. The current produced by a single solar cell is very less. However when this current is drawn by the wires, it can power a small motor or other small electronic devices. Many solar cells when combined together can produce sufficient amount of electricity to power a house. However the main disadvantage of this technology is that manufacturing cost of these panels is very high, also you need large amount of solar panels if your energy requirement is very high. This is the reason why solar panels and electricity produced through them have a very high start up cost. The advantage is that when solar panel when installed can produce electricity virtually free.

Cite This Document

Related Documents

  • essay

    ... Page FS Note 1 For 2007 was there a foreign Currency translation adjustment? (circle one) Yes No 46 S of SE 2 Did the adjustment cause a Decrease or Increase in S/E for 2007? (circle one) Increase Decrease 3 For 2007, and in association with the 2004-2007 Restructuri...

    Read More
  • essays

    ...essays suck. I hate thembdshhbfvdi hvihndinhviudfhuvnhgudfhg sddkbfvgghhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh- hhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh- hhhhing a match with William Regal, Truth was attacked by Carlito and Primo, who were paid off by DiBiase after the assault. Truth went on to wrestle and defeat ...

    Read More
  • essay

    ... Bankers Adda How to write Essay in SBI PO Exam? Dear readers, as you know that SBI PO 2014 Paper will also contain a Descriptive Test of 50 marks (1 hour duration), which will consist of English Language Comprehension, Short Précis, Letter Writing & Essay). So, here we are presenting you "How to write Essay?" and few points to remember ...

    Read More
  • Essay

    ...Social Media Marketing Note On Smo Marketing Essay Social Media Optimization can be defined as a process of achieving Marketing Communication and Branding goals through the use of various Social Media Websites. It is a process to optimize web sites, so that they are easily connected or interlaced with online communities and community website...

    Read More
  • Oil Sands Essay

    ...always had extensive deposits of oil sands, and has been a fascination to the explorers and settlers of earliest Canada, when Europeans saw how First Nations people used it to water proof their birch bark canoes. That being said, the majority of oil sands in Canada are contained in Alberta. Alberta’s oil reserves play an important role in the ...

    Read More
  • Blood and Oil Essay

    ...Michael T. Klare, Blood and Oil: The Dangers and Consequences of America’s Growing Dependency on Imported Petroleum (New York: Metropolitan Books/Henry Holt, 2004). Preface How to explain the post-Cold War violence? Some attribute it to identity politics (xi-xii). Pace Samuel Huntington, the cause is a struggle for resources (xii)....

    Read More
  • Oil Sands Essay

    ...The importance of oil in our society is so great that it affects developed and developing countries. It is a huge contributor to economic growth and environmental destruction. Although the Alberta Oil Sands has destroyed acres of local and global (indirectly) ecosystems, it has achieved and ensured that Canada stays as an economic power. The eco...

    Read More
  • The Essay by Essay

    ...The fact of the Annunciation of the Blessed Virgin Mary is related in Luke 1:26-38. The Evangelist tells us that in the sixth month after the conception of St. John the Baptist by Elizabeth, the angel Gabriel was sent from God to the Virgin Mary, at Nazareth, a small town in the mountains of Galilee. Mary was of the house of David, and was espou...

    Read More

Discover the Best Free Essays on StudyMode

Conquer writer's block once and for all.

High Quality Essays

Our library contains thousands of carefully selected free research papers and essays.

Popular Topics

No matter the topic you're researching, chances are we have it covered.