Best example of it is a motion sensor light you hear a click when it switches on, the motion sensor sees you it gives a voltage to an electro magnet for a few minutes on a timer, when the magnet is not under voltage the switch opens and click the light goes off.
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Bobbob (Site Administrator)
I'd like to see this man's EKG after so many years of abuse. But he teaches people stuff... still a good man though.
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(Old Spike)
Best example of it is a motion sensor light you hear a click when it switches on, the motion sensor sees you it gives a voltage to an electro magnet for a few minutes on a timer, when the magnet is not under voltage the switch opens and click the light goes off.
(Site Administrator)
I'd like to see this man's EKG after so many years of abuse. But he teaches people stuff... still a good man though.