What type of device detects the presence of moisture and can prevent electric shock?

A Ground Fault Circuit Interrupter (GFCI) is specifically designed to detect the presence of moisture and prevent electric shock by interrupting the electrical circuit when it senses an imbalance of electrical current. This imbalance usually occurs when the current flows through an unintended path, which often happens in wet environments.

GFCIs are commonly installed in areas where water and electricity could potentially come into contact, such as bathrooms, kitchens, and outdoor outlets. When a ground fault occurs, the GFCI can react quickly—typically within milliseconds—to cut off power, significantly reducing the risk of electric shock. This makes it an essential safety device for protecting individuals and ensuring safe electrical practices in moisture-prone areas.

In contrast, other devices like surge protectors and voltage regulators serve different purposes. Surge protectors protect against voltage spikes, while voltage regulators stabilize voltage levels without directly addressing safety in moist environments or preventing electric shock. Therefore, the GFCI is the most appropriate choice for detecting moisture and enhancing safety against electric shock.