3A Electrical Practice Test

To find the square mil area of a conductor that measures 0.250 inches on each side, we start by converting the measurement to mils. One inch is equal to 1,000 mils, so 0.250 inches is equal to 250 mils.

Next, since the conductor has a square shape, we can calculate the area using the formula for the area of a square, which is side length multiplied by itself. Thus, the area in square mils would be:

Area = side length × side length

Area = 250 mils × 250 mils

Area = 62,500 mils²

This calculation confirms that the area of the conductor is 62,500 square mils, which aligns with the answer provided. Understanding this process is crucial for electrical practice, as determining the cross-sectional area of conductors is fundamental for ensuring appropriate sizing for current-carrying capacity and other electrical characteristics.