What is a photocell? Detailed answer

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What is a photocell? Detailed answer

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What is a photocell?

There are many photocells that are used for different purposes. The most famous of them is the one due to which it seems that the door opens by itself when we approach it. This can be seen, for example, in stores. This happens because the body of the approaching person blocks the beam of light in a certain place and the photocell causes the door to open.

Light is a form of energy. When light strikes certain chemicals, such as selenium or silicone, its energy causes electrons to move through the substance. When two different substances are close by touching each other, some electrons can move from one substance to another. Imagine that one such substance is an external wire that connects to another substance and forms, as it were, a path for electrons. And as long as light hits the chemical, a constant stream of electrons travels through the substance and through the wire. This flow of electrons is called electric current. The path along which electrons move is called an electrical circuit.

A device that produces or increases the strength of an electric current as long as it is exposed to light is called a photovoltaic cell, or simply a photocell. photocells are used in different ways. For example, in solar panels placed on satellites and spacecraft, a large number of solar cells are connected together. In a camera exposure meter, the scale is connected to an electrical circuit that has tiny photocells. The scale registers the current passing through the circuit. This gives an idea of how much light is getting to the photocell.

Author: Likum A.

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