Question

electrical power tools must be ____ by a 3 - wire cord, __ insulated, powered by a low - voltage transformer, or powered by a self - contained ____. secured, partially, circuit grounded, double, battery wrapped, triple, control panel intersected, fully, generator

Explanation:

For electrical power tools safety, grounding via a 3 - wire cord is a standard safety measure. Double insulation is also a common safety feature for electrical tools, and battery - powered (self - contained battery) tools are a safe option. The other options have incorrect terms: "Secured" doesn't fit the electrical safety context for the first blank, "Wrapped" and "Intersected" are not relevant electrical safety terms for the first blank, and the third terms in other options like "circuit", "control panel", "generator" don't fit the "self - contained" power source context as well as "battery".

Answer:

B. Grounded, double, battery