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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.
During project days or workshops contact time with students is limited. It is therefore important for us to quickly ascertain student level of knowledge and then build on it or reinforce it. Analogies provide a good method of finding out students pre-existing level of understanding on this topic.
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.
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.