What is one of the main risks associated with ungrounded power tools?

The main risk associated with ungrounded power tools is the potential for electric shock. Ungrounded tools lack a direct electrical connection to the ground, which is a safety feature designed to protect users from electric shock. In the event of a fault, such as a short circuit or insulation failure, there is an increased risk that the electrical current could flow through the body of the user instead of being safely directed to the ground. This can result in serious injury or even fatal electrocution.

Other options, while they may have implications for power tools, do not directly address the primary safety concern related to grounding. For instance, reduced portability does not relate to the safety of tool use, and higher efficiency and increased battery life pertain more to performance and functionality rather than electrical safety and the inherent risks of using tools without proper grounding.