photoelectric cell
noun/ˌfəʊtəʊɪˌlektrɪk ˈsel/
/ˌfəʊtəʊɪˌlektrɪk ˈsel/
(also photocell)
- an electric device that uses a stream of light. When the stream is broken it shows that somebody/something is present, and can be used to control alarms, machines, etc.Topics Engineeringc2
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photoelectric cell