What is a cad cell?
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Q4: _ voltage controls are simply controls that
Q5: Three-wire controls depend on a set of
Q6: In a control circuit for a hot
Q7: What are some advantages of three-wire control
Q8: What is the relationship between three-wire control
Q9: Photodetectors can be used to sense the
Q10: Photo-operated devices fall into one of three
Q11: The transmitter section of a photodetector is
Q12: Photoemissive devices emit _ when in the
Q14: List some advantages of using a photodetector.
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