What could occur if a neutral wire is broken?

When a neutral wire is broken, it can lead to unsafe voltages and shock hazards. The neutral wire serves to complete the circuit by providing a return path for the current, balancing the electrical system. If this return path is interrupted due to a broken neutral, it can cause voltage imbalances in the system.

This imbalance can result in devices receiving higher voltages than they're designed for, leading to overheating, damage, or potentially causing the devices to malfunction. Additionally, without a proper neutral connection, certain situations could create potential shock hazards, as users may come into contact with surfaces that are unexpectedly energized due to these changes in voltage.

The other options do not demonstrate accurate consequences of a broken neutral wire. For instance, a broken neutral will not lead to increased circuit efficiency or enhanced electrical flow; instead, it compromises the safety and reliability of the entire electrical system.