Light-sensitive resistor or Photoresistors are electronic components that resistance will decline if there are additional light intensity about it. Photoresistors can also refer to a light-dependent resistor (LDR), or a photoconductor.
Photoresistors made of semiconductors that have very high resistance. If the light is about to have a high enough frequency, photons absorbed by the semiconductor will cause the electrons have enough energy to jump into the conduction band. 
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