Electrical wiring is commonly composed of metal covered in plastic or rubber coating. Which of these materials is an insulator and which is a conductor?

Question

anonymous · Answer

@kmullis6 Well, look at something you know: a power cord.  What portion of the cord gets plugged into the wall?  A metal portion or a rubber (or plastic) portion of the cord.

kmullis6 · Answer

Metal is the conductor. Plastic or rubber coating is the insulator. Right? @mrdoldum

anonymous · Answer

@kmullis6 Yep.