Recreational Vehicle (RV) Technician Practice Test

What is the primary function of a ground fault circuit interrupter (GFCI)?

1. To increase voltage safety

2. To protect against ground faults

3. To measure electrical load

4. To enhance circuit performance

The correct answer is: To protect against ground faults

The primary function of a ground fault circuit interrupter (GFCI) is to protect against ground faults. GFCIs are designed to quickly detect differences in the electrical current flowing through a circuit. When there is an imbalance, which typically indicates that current is leaking from the circuit (possibly to the ground due to an unintended path), the GFCI will trip and cut off power in milliseconds. This action mitigates the risk of electric shock or electrocution, especially in wet or damp environments where the likelihood of ground faults is increased, such as bathrooms, kitchens, or outdoor areas. This protective mechanism is crucial for maintaining safety in areas where people are more vulnerable to electrical hazards. The other options do not accurately describe the GFCI's main role; increasing voltage safety and enhancing circuit performance pertain more to circuit design and regulatory standards, while measuring electrical load focuses on the amount of electricity being used rather than addressing safety against faults.