How does the pointer multimeter measure the quality of the photoresistor?
Photoresistors, also known as light pipes, are commonly made of cadmium sulfide, as well as selenium, aluminum sulfide, lead sulfide, and bismuth sulfide. These fabrication materials have the characteristic that their resistance value decreases rapidly under the irradiation of light of specific wavelength. This is because the carriers generated by the light are all involved in conduction, drifting under the action of an external electric field, the electrons rush to the positive pole of the power supply, and the holes rush to the negative pole of the power supply, so that the resistance of the photoresistor drops rapidly.
Photoresistor is a special resistor made of semiconductor materials such as vulcanization or selenization. , under the harsh environment of humidity, it can also maintain a high degree of stability and reliability, and can be widely used in cameras, solar garden lights, lawn lights, money detectors, quartz clocks, music cups, gift boxes, mini night lights, light and sound switches , Street lamp automatic switch and various light-controlled toys, light-controlled lighting, lamps and other light automatic switch control fields.
Sensitive resistor symbol representation
A photoresistor is a light-sensitive component whose resistance value can change with the intensity of external light. The photoresistor is represented by the letter "R" or "RL" or "RG" in the circuit, and the figure below is its circuit graphic symbol.
