OSHA 30 Hour Construction Program Practice Test

What functions does a Ground Fault Circuit Interrupter (GFCI) perform?

1. Protects from shock, detects current differences, shuts off electricity quickly

2. Regulates voltage levels, enhances power supply, and prevents flooding

3. Monitors battery levels, improves energy efficiency, and prevents overheating

4. Provides backup power, manages load distribution, and controls lighting

The correct answer is: Protects from shock, detects current differences, shuts off electricity quickly

A Ground Fault Circuit Interrupter (GFCI) is an essential safety device designed to protect individuals from electrical shock, particularly in wet or damp locations where the risk increases significantly. The correct answer details the key functions of a GFCI: it protects from shock, detects current differences, and shuts off electricity quickly. When a GFCI is installed, it continuously monitors the flow of electricity. If it detects an imbalance between the outgoing current and the incoming current—indicating a potential ground fault or leakage of current that could lead to an electric shock—it will react swiftly, typically within milliseconds. This quick response cuts off the electrical supply, significantly reducing the possibility of serious injury or electrocution. By focusing on these protective measures, GFCIs help ensure a safer environment, especially in situations where people are more vulnerable to electric shock, such as in bathrooms, kitchens, and outdoor areas. Other options describe functions that are not related to the purpose of a GFCI. For instance, regulating voltage levels, enhancing power supply, or preventing flooding pertains to different types of electrical devices or systems, showcasing how safety devices like GFCIs serve a specific and critical function in electrical safety management.