Final answer:
You should never engage the lock on the trigger of power tools for safety reasons. This prevents unintentional operation leading to potential accidents. Additional safety tips include working with one hand while dealing with high-power circuits and avoiding contact with water to prevent electrocution or electrical fires.
Step-by-step explanation:
On power tools, you should never engage the lock on the trigger. This is a critical safety feature that prevents the power tool from operating unintentionally, which could lead to accidents and injuries. Safety is the top priority when handling any power tools to avoid dangerous situations.
Regarding other electrical safety measures, when working with high-power electric circuits, the suggestion to work "one-handed" or "keep one hand in your pocket" is to minimize the risk of electrical current passing through the heart if an accidental shock occurs. This can be a life-saving practice. Similarly, we are advised not to flick electric switches with wet hands or throw water on an electric fire because water conducts electricity. This can lead to electrocution or exacerbate the electrical fire since water can spread the electric current.