Which factor most directly affects the resistance of a wire?

Which factor most directly affects the resistance of a wire?

• A. Color
• B. Temperature
• C. Length
• D. Material

Answer: (D)

Resistance in a wire is shaped by how easily electrons can move through the material, which comes down to the material’s resistivity. This intrinsic property varies from one material to another, so a wire of the same length and thickness made from different materials will have different resistance because the material sets the baseline level of opposition to current. Temperature can change resistivity and thus resistance, and longer wires increase resistance as well, but those are changes within the same material. Color, on the other hand, has no effect on electrical resistance. So the material is the factor that most directly determines how much resistance the wire has.

Resistance in a wire is shaped by how easily electrons can move through the material, which comes down to the material’s resistivity. This intrinsic property varies from one material to another, so a wire of the same length and thickness made from different materials will have different resistance because the material sets the baseline level of opposition to current. Temperature can change resistivity and thus resistance, and longer wires increase resistance as well, but those are changes within the same material. Color, on the other hand, has no effect on electrical resistance. So the material is the factor that most directly determines how much resistance the wire has.