Are electricons used up in a circuit?

No, electrons are not used up in a circuit. The movement of these electrons provides usable power, but the flow of electrons (defined as current) does not terminate at some random location, it continues back to the source (ie, electrons flow in a loop from the power plant, out to your home, back to the power plant). Mechanical and chemical energy are used to start these electrons moving; this is the energy you use when you use electricity.