Photovoltaic cells are devices that convert light into electricity. Sometimes called a solar cell, photovoltaic cells have been used since 1883. Charles Fritts inventor of the cell with the aid of selenium but this process was soon stopped in 1954 when Darryl Chapin silicon used instead of selenium. The photovoltaic cells use conversion by the photoelectric effect. The photoelectric effect occurs when a metal surface bombarded with electromagnetic radiation. Photons are the kind of electron that produces an electrical current. When the light is increased, the metal surface is first reacted more slowly, but more and more solar energy is converted into electricity. Each metal surface used a different threshold at which they are only able to produce as much energy, while the rest of the solar energy to be reflected is detected thereafter.
The frequency of the light and its reaction with the metal surface causing light electrons. Each photon in the light energy of a single electron. The electrons emitted are often referred to as photo-electrons. The photo-electrons can be converted into electrical energy, which can serve many applications and does not lead to pollution and greenhouse gases.
At first photovoltaic cost a lot of money. The price of the energy and it is used to produce electricity equipment was higher than the actual savings of the user received. In the early days it was at $ 100 per watt, these days you can usually purchase the electricity generated from the product at about $ 20 per watt. This type of energy is produced in remote areas where a high-voltage line or a generator is not feasible. By placing these cells of the people who live or work in this may have from a region of a constant supply of electricity.
This type of solar cell has been used many times in the public service locations. They were used to power the intersections, traffic signs, lampposts and other Department of Transportation issues that may be a long way from the source of his strength. It is more economically viable to a solar box on a remote road crossing sign over the power chords tribe and build power poles for the electricity to the device. This ensures more safety in remote areas where drivers or pedestrians can see it being compromised.
Since the oil crisis of 1973, photovoltaic cells have come a long way in both technology and cost. These solar cells are even used in nautical machines. Buoys with lights boats and ships the channel or the water passage had let us see on a regular basis to be changed by the introduction of new ones. Now, these solar cells can continue to fascinate burn off the energy from the sun. Solar energy has the roads, sea roads and other road transport safer and easier to navigate made.
Photovoltaic modules are the main source of power for many space systems. Solar energy is the only source of energy once you leave the atmosphere of the Earth. By clicking on the rays of the sun on solar cells, the satellites, spacecraft, space station and other satellite in orbit systems can remain in space longer and operate with little maintenance. Without solar cells, the future of space exploration to other planets or other space ventures are not possible. Capturing the sun’s rays on a solar shield in space gives the astronauts electricity to computer systems, life support systems running, and all that is needed to sustain life while aboard the station.
The improved technology of solar energy has increased household uses as well. With the new trend of the construction of greenhouses, solar panels installed to be included in the solar energy and converts it into electricity. These solar panels generate enough electricity to be heated to hot water tanks, turning devices, and give the family enough electricity that is required for survival. Obviously receive additional electricity to most of these houses if there is a problem with the solar battery or if a cloudy day that would hinder the production of electricity. Solar panels are not only used to power household homes, but they are also used for large high rise stream. Whole business complexes are powered by solar energy.
The photovoltaic modules in solar cells are being studied. They have a variety of applications that can be expanded in industry, technology, space, and even in your own home. As the cells grow better they also become cheaper. As the world pushes for increased demand for energy and global market raised the price of oil and other non-renewable resources to breaking point, the average man looking for a way to save some money. Photovoltaic cells will soon be a part of every aspect of our lives dealing with electricity. Whether it’s a handheld game or a motorcycle on an aircraft carrier, this technology will be the last remaining bastion of strength when all fossil fuels are gone, or we have damaged our planet so much that fossil fuels are no longer a viable way to create energy .
Source: http://ezinearticles.com/?Solar-Technology-History—Some-Facts-and-Figures&id=4411309 by Wayne Singleton