Final answer:
GFCI testers are used to check the functionality of GFCI outlets, which are safety devices that quickly respond to leakage currents to prevent electric shocks. Various models of GFCI testers exist and are useful for ensuring these outlets function properly. Circuit breakers, which protect against circuit overloads, are a different type of electrical safety device.
Step-by-step explanation:
A ground fault circuit interrupter (GFCI) is an essential safety device used in households, particularly in bathrooms and kitchens where the risk of electric shock is higher due to the presence of water. GFCI outlets are designed to respond quickly to changes in current and interrupt the circuit if they detect a leakage current greater than 5 mA, which is the threshold for a potentially harmful electric shock. These devices help prevent electric shocks by comparing the currents in the live/hot and neutral wires and tripping when there is an imbalance, indicating that electricity is taking an unintended path potentially through a person.
There are various models of GFCI testers available on the market for checking the proper operation of GFCIs. These testers simulate a leakage current to ensure that the GFCI is responsive and will trip as needed for safety. Consumers should look for testers with clear instructions and indications to effectively test and ensure the operational integrity of GFCIs in their homes.
It's important to note that GFCI testers are different from circuit breakers, which are also safety devices that protect electrical circuits from overload or short circuits by opening the circuit. Circuit breakers operate on a different principle and are also an important part of household electrical safety, usually located in the electrical service panel.