Red Seal Construction Electrician Practice Exam

What is the purpose of a GFCI (Ground Fault Circuit Interrupter)?

1. To enhance connection speed

2. To protect against electrical shock

3. To improve circuit energy efficiency

4. To regulate voltage levels

The correct answer is: To protect against electrical shock

The purpose of a GFCI (Ground Fault Circuit Interrupter) is to protect against electrical shock. This device is specifically designed to monitor the current flowing through a circuit. If it detects an imbalance—indicating that electricity is flowing through an unintended path, such as through a person's body during contact with a live wire or faulty appliance—it quickly cuts off the power to reduce the risk of severe electric shock or electrocution. GFCIs are typically used in areas where the risk of ground faults is higher, such as bathrooms, kitchens, outdoor outlets, and other wet locations. Their ability to rapidly disconnect the electrical supply enhances safety in environments where moisture increases the risk of electrical hazards, thereby making them crucial safety devices in modern electrical installations. In contrast to the other options, enhancing connection speed, improving circuit energy efficiency, and regulating voltage levels are functions more associated with other electrical devices or systems, but do not relate directly to the primary safety purpose of a GFCI.