What is a photoresistor?

The photoresistor, often referred to as a light -dependent resistor, is a resistor that responds to an increased exposure to the light by reducing its resistance in the circuit. They are used in different devices that require light sensitivity, such as hot watches and street ramps that light up when the sun decreases. Photo -resistors are part of a larger group of sensors known as photodetectors, which are devices that react to light.

resistors are present in almost all types of electrical circuits. They operate to block the flow of electricity through the circuit so that it remains safe. In the case of a photoresistor, it also serves as a switch and regulates the flow of electricity based on the amount of light to which they are exposed. They usually have two spikes connected to a photo -sensitive board. When light on the platform lights reach high levels of high levels, it stimulates electrons in the device and gives them enough energy to free themselves from their bonds. These exempted electrons allow eLek to flowThrow the photoresistor.

Use for photoresistor are enhanced. They are commonly seen in smaller devices in the form of cadmium sulfide (CDS) cells. CDS cell, a term that is largely considered to be synonymous with the term photoresistor, in many forms of hours and watches, measuring lights in cameras and street lamps.

CDS Cell is made by placing cadmium sulphate, which has added adultery, a process known as doping, on a ceramic basis. The doping material is closer to the point where the belt for electricity guide, so the electrons do not have to move as far as they are unrestrained and perform electricity. This means that it does not need such a high frequency of light of this type of photoresistor to change resistance. The main advantage of the CDS cell is that it is more sensitive to the spectrum of light that people use, which is one of the reasons used in items such as meters of camera lights and street lamps.

The second type of commonly seen photoresistor is made of silicon. Silic -cozistors are not as good semiconductor as CDS cells because they need higher light frequencies to make electricity because the tapes for electron movement are not so easily accessible. The silicon photoresistor is more likely to be seen on devices that are sensitive to infrared or red light, such as infrared detectors.