Please explain

Asked by  | 21st Mar, 2009, 11:24: AM

Expert Answer:

A photoconductive cell is a resistor whose resistance decreases with increasing incident light intensity. It can also be referenced as a photoconductor.

A photoresistor is made of a high resistance semiconductor. If light falling on the device is of high enough frequency, photons absorbed by the semiconductor give bound electrons enough energy to jump into the conduction band. The resulting free electron (and its hole partner) conduct electricity, thereby lowering resistance.

Answered by  | 27th Mar, 2009, 11:56: AM

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