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.
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.
One way to make this topic more accessible is to use analogies (Lakoff and Johnson 2008). Analogies are examples which possess similar features, or work in a comparable manner, to the ideas that you wish to teach (Harrison and Coll 2007). They offer an excellent method of visualising difficult and unfamiliar concepts, or ideas that can not be directly seen.
When an open circuit to earth ground is detected, the G.F.I. device immediately opens the voltage source to the device. G.F.I. devices are similar to circuit breakers but are designed to protect humans rather than circuit components.
Phase converter wiring diagram new rotary
Static inverter wiring diagram image collections
Luminous inverter wiring diagram new what is static bypass