*Question G0B05:
Which of the following conditions will cause a ground fault circuit interrupter (GFCI) to disconnect AC power?*  

*Correct Answer is  B: Current flowing from one or more of the hot wires directly to ground*  

### AI Response: (may contain errors)  

A Ground Fault Circuit Interrupter (GFCI) is designed to protect against electrical shock by detecting imbalances in electrical current. Let's break down the question and the choices:

### Correct Answer: 
**B: Current flowing from one or more of the hot wires directly to ground**

- **Explanation**: A GFCI monitors the current flowing through the hot and neutral wires. If it detects that the current flowing through the hot wire does not match the current returning through the neutral wire, it assumes that some of the current is leaking to ground (which can happen if a person touches a live wire). When this imbalance occurs, the GFCI quickly disconnects the power to prevent electric shock.

### Why the Other Choices are Incorrect:

- **A: Current flowing from one or more of the hot wires to the neutral wire**  
  - **Explanation**: This condition is normal operation in a circuit. The GFCI does not trip when current flows from hot to neutral as long as the current is balanced. It only trips when there is an imbalance indicating a ground fault.

- **C: Overvoltage on the hot wires**  
  - **Explanation**: Overvoltage refers to a condition where the voltage exceeds the rated voltage of the circuit. While this can be dangerous, it does not directly cause a GFCI to trip. GFCIs are designed to detect current imbalances, not voltage levels.

- **D: All these choices are correct**  
  - **Explanation**: Since only choice B is correct, this option is incorrect. A GFCI specifically responds to ground faults, not to normal current flow or overvoltage conditions.

### Summary:
- A GFCI trips when it detects an imbalance in current, specifically when current flows from hot to ground (choice B).
- Normal current flow from hot to neutral (choice A) does not cause a trip.
- Overvoltage (choice C) does not trigger a GFCI.
- Therefore, the only correct condition that causes a GFCI to disconnect power is when current flows directly to ground.