Here's why:

* Metals are good conductors: Metals like iron (the main component of most coat hangers) have free electrons that can easily move throughout the material. This allows for the flow of electrical current.

* Insulators resist flow: Insulators, on the other hand, have tightly bound electrons that don't move easily, preventing the flow of electricity.

In short: If you try to pass electricity through a metal coat hanger, it will easily flow through it.