Question: how does electricity travel?

Andrei Luchici answered on 18 Jun 2014:

Great question! The electric charge is usually carried by moving electrons present in the material. Generally speaking you can say that an electric current is a flow of any charged particles (such as ions).

For example, conductive metals have free electrons which do no belong to a particular atom. These electrons are usually moving randomly around the material. When you apply an electric field you are forcing all of the free electrons to move in a particular direction which creates an electric current through that material.