Electric current is one of the hardest things to wrap your head around when you’re first getting into the electrical trade. Many apprentice electricians get confused with the difference between current and amps. Well, that’s because people talk about electrons and charges and interchange the terms without really knowing what the difference is.
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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.
In order for electricity to work, there has to be movement. Static electricity still needs movement to occur in order to discharge and equalize charges. The only way that movement becomes useful is once there is a difference of potential present. That is what voltage is all about.
This episode goes further in depth on how 3-way and 4-way switches work. This is for those visual learners out there that need the logic drawn out so they can see the whole circuit in front of them.