Which special component would you use to detect the light levels in a circuit that switches lights on automatically when it gets dark?

Explanation:

light-dependent resistors

LDRs (light-dependent resistors) are used to detect light levels, for example, in automatic security lights. Their resistance decreases as the light intensity increases: in the dark and at low light levels, the resistance of an LDR is high and little current can flow through it.

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