A photoresistor is described as whose electrical resistance _______ when exposed to light.

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Multiple Choice

A photoresistor is described as whose electrical resistance _______ when exposed to light.

A photoresistor’s resistance varies with light. When light shines on the semiconductor, photons create additional charge carriers, making it easier for current to flow and thus lowering the resistance. In darkness, fewer carriers exist, so the resistance climbs. So the best description is that its electrical resistance changes when exposed to light. If you need the usual direction, it tends to decrease with more light and increase in the dark, which is why photoresistors are useful for light sensing and automatic control.

A photoresistor’s resistance varies with light. When light shines on the semiconductor, photons create additional charge carriers, making it easier for current to flow and thus lowering the resistance. In darkness, fewer carriers exist, so the resistance climbs. So the best description is that its electrical resistance changes when exposed to light. If you need the usual direction, it tends to decrease with more light and increase in the dark, which is why photoresistors are useful for light sensing and automatic control.

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