Amp Up Your Skills: Electrifying 2025 Electrical Inspection Exam Challenge!

The primary function of a Residual Current Device (RCD) is to detect imbalances in electrical current and disconnect the circuit. This device monitors the difference between the live (phase) and neutral wires in an electrical circuit. If it detects an imbalance, which could indicate that current is leaking to earth—potentially through a person— it quickly disconnects the circuit. This rapid disconnection helps to prevent electric shock and reduces the risk of electrical fires due to faults in insulation or equipment.

The other options focus on different functions unrelated to the core purpose of an RCD. For instance, boosting voltage pertains to devices like transformers, which are used to step up or step down voltage levels in a power system. Stabilizing frequency would involve frequency regulation systems typically seen in power generation and distribution systems, which is not a role played by RCDs. Regulating current flow relates more to devices like circuit breakers or fuses that control current to prevent overloads in circuits, rather than detecting current imbalances. Thus, the focus of an RCD is specifically on monitoring and providing safety against current leakage.