Automatic circuits work on the philosophy that some external/automatic switch turns power on and off to a circuit. This can be a photocell or timeclock that controls a set of relays or contactors which allow or disallow current to flow in a circuit.
Automatic circuits work on the philosophy that some external/automatic switch turns power on and off to a circuit. This can be a photocell or timeclock that controls a set of relays or contactors which allow or disallow current to flow in a circuit.