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 - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
... [Read Article]
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