Your nerves do not work quite the same way as an electric wire.
Electricity is a movement of charge.
In a wire the electrons move to carry the charge along the wire. In a nerve the electrical signal moves although no electrical charge actually moves along the nerve - the signal travels in the form of an action potential. The inside of nerve cells normally has a slight negative charge as a result of the activity of pumps which move charged ions prodominantly out of the cell. When an electrical charge is placed near a nerve cell it causes gates in the membrane to open and allow the ions to reenter the cell and depolarise the membrane near the position where the charge is located. You have nerves in every part of your body and impulses are sent electrically from the brain to all parts of the body.