Photoresistor

A photoresistor is a light-controlled variable resistor. The resistance of a photoresistor decreases with increasing incident light intensity. As the squiggly face is exposed to more light, the resistance goes down.

When its light, the resistance is about 5-10KΩ, when dark it goes up to 200KΩ. To use, connect one side of the photo cell .

Photoresistor definition. The name photoresistor is the combination of words: photon (light particles) and resistor. In other words, the flow of electric current through the photoresistor increases when the intensity of light . The photoresistor can be manufactured with different figures and illuminated area based on this characteristic. The light dependent resistor, LDR, is known by many names including the photoresistor , photo resistor , photoconductor, photoconductive cell, or simply the photocell.

It is probably the term photocell that is most widely used in data and instruction sheets for domestic equipment. The more intense is the light the more free carriers are formed and therefore the lower gets the resistance of the element.

Two exterior metal contacts of the photoresistor are reaching through the . Learn about the properties of semiconductors that allow photoresistors to measure and respond to changes in. Many types of photoresistors have been develope serving a variety of uses. For instance, cadmium sulfide cells are used in street lights, camera light meters, clock radios, security alarms, and outdoor clocks.

Ge:Cu photoconductors are excellent detectors of far-infrared radiation and are valuable for infrared astronomy . This is a small size LDR with a size of 5mm. While walking through the streets in the evening, have you ever noticed how the street lights turn on automatically as it starts getting darker? This automatic switching ON of the street lights are due to the presence of a special type of variable resistor on its circuit. As a result, photoresistors convert light energy into electrical energy.

Inches or 5mm (Across round section). The cadmium sulfide (CdS) or light dependent resistor (LDR) whose resistance is inversly dependent on the amount of light falling on it, is known by . The use of this feature will work made ​​of different shapes and light-receiving area of the photosensitive resistance. Table Of contents: ○ Introduction. Controlling Light Intensity. A common application for photoresistors is the triggering of an event when the light passes a certain point.

This example demonstrates the use of a photoresistor to toggle the.