Which safety device is used to ground electrical tools?

The use of a ground fault interrupter (GFI) is essential for grounding electrical tools as it acts as a safety device that automatically disconnects electrical circuits whenever it detects a ground fault, which is an unintended electrical path between the source of current and the grounded surface. This helps to prevent electrical shock and reduces the risk of electrocution, especially in wet or outdoor environments where tools may be exposed to moisture.

Unlike safety goggles, which are designed to protect the eyes from hazardous materials or projectiles, or extension cords, which are used to extend the reach of electrical power but do not provide grounding, the ground fault interrupter has a direct role in ensuring that equipment and individuals are protected from electrical hazards. A voltage meter, while useful for measuring electrical voltage, does not serve as a safety device for grounding tools. Therefore, the ground fault interrupter is the appropriate answer as it specifically addresses grounding and safety concerns for electrical tools.