What is a primary function of a ground fault interrupter?

• A. To increase circuit voltage
• B. To short-circuit electrical devices
• C. To protect against electric shock
• D. To provide power backup

Answer: (C)

A primary function of a ground fault interrupter (GFI), also known as a ground fault circuit interrupter (GFCI), is to protect against electric shock. This device is designed to monitor the electrical current flowing through a circuit. If it detects an imbalance, indicating that some of the current is escaping to the ground—perhaps due to a person touching a live part—it quickly cuts off the electrical supply, reducing the risk of electric shock.

The effectiveness of a GFI in preventing electrocution and serious injuries makes it an essential safety feature, especially in environments prone to moisture, such as bathrooms and kitchens, where the risk of electric shock is higher. Its rapid response time can prevent potentially fatal accidents, illustrating its crucial role in electrical safety measures.

The other options do not align with the function of a GFI; they serve different purposes unrelated to its primary role of shock prevention.