What is resistance?

Resistance is when you move a magnet the meter got one way and when you take it out the meter goes the opposite way

How is it incadesent?

How it incadesent is by containing a filament that glows while-hot when heated by a current passed through it. Or emitting light as a result of being heated.

What is the difference with a metal pipe and a PVC pipe, with a magnet going through it?

PVC pipe is an insulator and a magnet goes straight through it, but a metal pipe is a conductor and the magnet take longer to go through. Something is nesting it. Made a circuit for the electrons go through. The resistance is something that pushes against the electrical pole battery. to move electrons through circuit but the resistance is making it go away that it doesn’t want to go through. There’s always resistance no matter what.