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.
This open hands-on model building effectively combines theoretical and practical STEM skills. Analogies are ideal in supporting and complementing this practical model making and reinforcing the principles taught.
A circuit or wiring diagram is a visual display of an electrical circuit.
Short circuits are circuits that get back to the power source unused or with the same power as put out. Using these usually blow a fuse but sometimes doesnt. Doing this with a battery can cause electrical fires.