MEASUREMENT OF LIGHT USING L.D.R. A photo resistor consists of a device that change itselectrical Ohmic resistance when light is applied. Thus it is also called as photo conductive cell or the Light Dependent Resistor abb. L.D.R. The activeregion of photo resistor is a thin film of silicone, germanium, selenium, a metalliic helide or a metallic sulphide. When these type of materials are exposedto the light radiation, free electrons are created as photon energydrives them from a valence band into the conduction band.
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