Definition of "photoresistor" []

• An electronic component whose resistance is inversely proportional to the intensity of incident light; a photoconductor (noun)

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• "In most 'automatic'-mode strobes, the photoresistor controls a short-duration timer which drives a trigger circuit for the thyristor."
• "She recently built an "optical encoder," a photoresistor she programmed to count flashes of light."
• "It outputs a squarewave whose pitch is controlled by the amount of light striking a photoresistor."