Question

please tell about automatic street lights with sensors explain according to class 8 ​

Answer 1

Answer:

When lots of light falls on a CdS cell, then the resistance is very low, which means it conducts electricity well. ... When it gets dark, then not much current can flow to the electromagnet so the switch closes and allows electricity to flow to the streetlight, turning it on.

Explanation:

When there is a need of light it automatically switches ON. When darkness rises to a certain level then sensor circuit gets activated and switches ON and when there is other source of light i.e. daytime, the street light gets OFF. The sensitiveness of the street light can also be adjusted.

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