Dave, to power a 120 VAC light requires 120 VAC and where's that located ???? its across the Hot and Neutral WELL DUH its 120 VAC Hot/Line to Neutral......
If done correctly ??? Its ONLY the Hot that gets switched, so the hot comes from the panel or fuse board,,,,,,,to and through a switch to open or close the series circuit,,,,,,,,,,to one side of the light,,,,,,,,,other side of the light is return wired to Neutral and there's the 120 VAC across the 120 volt light making it glow, another WELL DUH.
Iffffffffff there are only two wires in a simple switch box (One to switch input other to switch output) those would be the LIVE unSwitched Hot and the Switched Hot NOOOOOOOOOO NEUTRAL. The Neutral is wired to the other side of the light. The Neutral may or may not pass through the box where the switch is located en route to the light, but it obviously has to get to the light someway. At the light there must be a Hot (even if switched on or off) and Neutral to have 120 volts to power a 120 volt light.....
At the box where the light is wired there's a switched Hot and a Neutral, so when switch is closed the light is wired across Hot and Neutral for 120 volts and it shines, but if the switch is open there's no Hot and no 120 volts and no glow.
That's about as simple as I can make it. You asked for electrical "experts" but this is far below that level of expertise lol
Hope this helps, this is veryyyyyyyyyyyyyyyyy basic series electricity 101
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