What is the function of the ground-fault circuit interrupter (GFCI) test button?

The function of the ground-fault circuit interrupter (GFCI) test button is to allow users to verify the functionality of the GFCI to ensure safety. GFCIs are designed to protect against electrical shock by quickly disconnecting the power when they detect an imbalance between the incoming and outgoing electrical current. By pressing the test button on a GFCI, the circuit interrupts the current flow, simulating a ground fault. This action confirms that the GFCI is operating properly and will respond effectively in a real fault situation.

Regularly testing GFCIs helps ensure that they are functioning as intended, which is crucial for maintaining a safe electrical environment, particularly in areas where water is present, such as kitchens and bathrooms. This added layer of safety reassures users that the device will trip when needed, thereby reducing the risk of electric shocks or fires. Other options provided do not accurately reflect the specific purpose of the test button.