Which of the following conductor types typically has the highest resistance?

The choice of bare aluminum as having the highest resistance is based on its material properties compared to the other options. Aluminum, while it is commonly used in electrical applications due to its lightweight and cost-effectiveness, has a higher resistivity than copper. This means that for the same dimensions, aluminum conductors will exhibit higher resistance than copper conductors.

In comparing the conductor types, bare aluminum typically has a higher resistance than bare copper, stranded aluminum, and solid copper configurations. While stranded aluminum is less solid and may have a varied cross-sectional area leading to slightly different resistance characteristics, its material still inherently has higher resistivity compared to copper. Solid copper, being a single, unbroken conductor, is more efficient in conductivity due to copper's lower resistivity. Consequently, when evaluating these conductor types, bare aluminum stands out due to its fundamental electrical properties, supporting the assertion that it typically exhibits the highest resistance.