The photoelectric effect is the result of the interaction of light with matter, in which light energy is absorbed and generates an electric current.If so the action of light generated electron beyond the physical body, the external photoelectric effect is observed when it remains within and change the conductivity of the material - the inner.
Practical application of the photoelectric effect in the art can be varied.In particular, the external photoelectric effect is used for sound reproduction, for example, in a movie.In addition, we set up special devices for measuring brightness, luminous intensity, illuminance.The phenomenon of the photoelectric effect is involved in the management of production processes.For this purpose there are special devices called solar cells.
solar cells and their application are based on the fact that changes in conductivity varies with illumination.Basically, these elements are used in control systems and accounting, for example, counting the finished product.Other Functions - control object falling into the restricted area.If the hand of the operator enters the press working area, the press immediately stops.This triggered a photocell.The same device is mentioned earlier in the turnstile in the subway: if payment is made (the photocell is turned off), the passage is opened, if there is no (photocells included), it is closed.
Improving air smoke also triggers the photocell signals a critical situation.The use of solar cells to machine tools possible to achieve higher accuracy machining.
Another possibility is the use of the photoelectric effect as a source of power, or solar panels.In these devices work is based on a variety of internal photoelectric effect, called brushless photoelectric effect.In this case, if light enters to the contact between two semiconductors arises emf, thereby possibly direct conversion of light into electrical energy.
Such solar cells are produced using compounds of gallium arsenide.They allow you to receive electricity without causing harm to the environment - the sun illuminates the surface of the battery and the output is ready for consumption.There are no complex mechanical devices, there is no need to burn fuel or build powerful dams.
However, this involves the use of the photoelectric effect is currently considerable difficulties.Firstly, do solar panels road and, accordingly, is a way to get electricity.Secondly, the efficiency of such conversion does not exceed 26%.However, work towards improving the efficiency and reduce the cost of conversion of luminous flux going on, and it is hoped that it will soon be ready quite effective and cheap solar cells.
Even today need space stations provide electricity in solar cells.And in places where for years there is a lot of sunny days, these converters operate.Prospects for the use of solar energy is very attractive.Experiments prove that solar energy allows to melt metal.And if we remember the legend that the ancient Greek scholar Archimedes, using a mirror, able to using sunlight to burn Roman ships, there is no doubt in the unlimited possibilities of the use of light as an energy source.
The submission examined the use of the photoelectric effect, the mechanism of its occurrence and variety.Examples of practical applications of the photoelectric effect in the art.
