Question

photocell uses only three marks question

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Answer 1

Answer:

Photocells are used in automatic lights to activate whenever it gets dark, and the activation/deactivation of streetlights mainly depends on the day whether it is day or night. These are used as timers in a running race to calculate the runner's speed. Photocells are used to count the vehicles on the road.

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Answer 2

Answer:

please give full questions