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RE: How the Photoresistor works: A simple, passive way to detect light using semiconductors
Cheap photoresistors are typically a small ceramic disc with a streak of the photoconductive material on top, and metal (usually steel I think because it's magnetic) leads coming out. More expensive ones will have a metal casing. The ones that cost a couple of cents are not going to have the metal housing but will still have the metal input leads.