A photo resistor consists of a device that change its electricalOhmic resistance when light is applied. Thus it is also called as photo conductive cell or the Light Dependent Resistor abb. L.D.R. The active region of photo resistor is a thin film of cadmium, selenium, a metalliic helide or a metallic sulphide. When these type of materials are exposed to the light radiation, free electrons are created as photon energy drives them from a valence band into the conduction band.
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