LEARNit Dictionary
photoelectric cell
noun
/ˌfəʊtəʊɪˌlektrɪk ˈsel/
UK
/ˌfəʊtəʊɪˌlektrɪk ˈsel/
US
1
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.
سلول فتوالکتریک, فتوسل