One wire is live, the other wire leads back to the breaker and carries extra live current back to the box - for a simple view.
If you put the switch on the nuetral wire, all the wires up to it are actually live all the time, including through the light fixture. That can be kinda exciting changing a bulb if you touch the socket....
If you put the awitch on the live wire, then when it is off, very little of the wires are 'live', only the one up to the switch.
Upside down or not wouldn't be a concern, it is whichever wire is hooked to it.
Switches have 2 different colored clamps, and you want to get the right wire onto the right clamp.
Any more, switches get hooked up with ground, and multiple lights, multiple switches, power feeding off to another switch or outlet, so there may be many more actual wires in any one switch box....
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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