👉 In electronics, a "photoresistance" is a phenomenon observed when light passes through a material that has a specific electrical resistance. This property allows certain materials to resist changes in their electrical conductivity or conductance as a result of exposure to light. Photoreaction refers to the phenomenon where a material with a photoresistivity reacts to an external electric field by changing its electrical conductivity or conductance, thus causing a measurable change in its electrical properties. This can be useful for various applications such as