Well, we learn that stuff in physics, even twice (once when we're 14 and once when we're 17 or 18, in final grade), but most people (sorry to say that, but especially girls) don't bother to listen 'cause they just say "but it's sooooo complicated, I can't understand that." So it doesn't help much.
Fixture wiring in Austria isn't exactly sophisticated but real simple. You've got just 2 or 3 wires hanging out of a hole in the ceiling to which you connect the fixture using choc blocks. Physicall the fixture is secured directly to the ceiling, that means, depending on the weight either some drywall screws driven into the lathes/drywall or anchors into the poured concrete ceiling or for pendant fixtures a solid hook driven into a joist or anchored to the concrete. Connections are usually covered by a plastic or metal cup which i always call "yoghurt can" 'cause it has exactly the shape of the small plastic cups in which they sell yoghurt here.
Worst idiots developed an easy way to remove the fixtures when moving, they just cut the wires and leave them bare or tape them up with band aid. I was _really_ surprised to find choc blocks on the wires when we moved into our last apartment!
In some cases I've also seen a receptacle fed through the ceiling light, that means 5 wires instead of 2 (switched phase, unswitched phase, neutral, and hot &neutral to receptacle). Luxurious older houses usually have 2 more wires for the butler bell, these can easily be distinguished because they're much thinner and have coloured cloth insulation (beige, orange, purple, green, brown, blue), compared to the black 220V wires.
