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20mm Ldr Sensor Light Dependent Resistor Sensor spiral wrap wires TE-03 Professional Soft Thin Styles20mm LDR Sensor Light Dependent Resistor Sensor also called photoresistor or LDR 20mm Light Dependent Resistor is a resistor whose resistance decreases with increasing incident light intensity; in other words, it exhibits Photoconductivity. A photo resistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the