Electric current flows in a closed path called an electric circuit. The point where those electrons enter an electrical circuit is called the "source" of electrons. The point where the electrons leave an electrical circuit is called the "return" or "earth ground". The exit point is called the "return" because electrons always end up at the source when they complete the path of an electrical circuit.
Anthony C. FischerCripps (2004).
The electronics companion
. CRC Press. p. 13.
An electric current is a flow of electric charge
. In electric circuits this charge is often carried by moving electrons in a wire . It can also be carried by ions in an electrolyte , or by both ions and electrons such as in a plasma http://www.explainthatstuff.com/electricity.html
Static electricity often happens when you rub two things together. If you rub a ballon against your jumper 20 to 30 times, you’ll find that the balloon sticks to you.This happens because rubbing the balloon gives it an electric charge. The charge makes it stick to your jumper like a magnet, because your jumper contains an opposite electric charge. So your jumper and the balloon attract one another…