Electric current (amperage) flow is the same in the wires going to and coming from the load. When a ground fault occurs, electric current now has another path and will take this path instead of returning to the source.
Current traveling in wires create magnetic fields around those wires. If the current is the same coming and going, the magnetic fields cancel one another. When there is a ground fault, the returning current has two paths. The returning current through the GFCI is less than the going, there is now a magnetic field difference through the transformer and the control unit will automatically open the circuit.
| GFCI Operation | |
 | Detects ground faults in tools or appliances. |
| GFCI opens the power circuit. |
| TEST button creates ground fault situation for testing GFCI receptacle. |
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