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A photoresistor (also known as a light-dependent resistor, LDR, or photo-conductive cell) is a passive component that decreases in resistance as a result of increasing luminosity (light) on its sensitive surface, in other words, it exhibits photoconductivity.
Description: Schematic symbol for a light-dependent resistor. Date: 3 July 2007: Source: Own work: Author: bdesham: Permission (Reusing this file)As a courtesy (but not a requirement), please e-mail me or leave a note on my talk page if you use this image outside of Wikipedia.
Photo resistor – Light dependent resistor (LDR) Antennas ... On a circuit diagram, electronic devices are represented by conventional symbols.
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When a photoconductive material is connected as part of a circuit, it functions as a resistor whose resistance depends on the light intensity. In this context, the material is called a photoresistor (also called light-dependent resistor or photoconductor ).
voltage regulators are often "U" for IC, pots and trimmers often "R" for resistor X: Socket connector for another item not P or J, paired with the letter symbol for that item (XV for vacuum tube socket, XF for fuse holder, XA for printed circuit assembly connector, XU for integrated circuit connector, XDS for light socket, etc.) X, XTAL, Y
See LEDs as photodiode light sensors. Photoresistors or Light Dependent Resistors (LDR) which change resistance according to light intensity. Normally the resistance of LDRs decreases with increasing intensity of light falling on it. [11] Photodiodes which can operate in photovoltaic mode or photoconductive mode.