The diagrams are a big help when workers try to find out why a circuit does not work correctly.
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.
A load of an electrical circuit may be as simple as those that power home appliances like refrigerators, televisions, or lamps or more complicated, such as the load on the output of a hydroelectric power generating station.
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.