Which factor is among the four that affect wire resistance?

Which factor is among the four that affect wire resistance?

• A. Type of conductor
• B. Insulation thickness
• C. Color coding
• D. Shielding

Answer: (A)

Wire resistance is set by the material’s resistivity, the length of the conductor, and its cross-sectional area (with temperature also playing a role). The type of conductor determines resistivity—different materials, like copper and aluminum, have different intrinsic abilities to resist current. Even if the wire looks the same shape, the material itself will yield different resistance values because of that resistivity difference. That’s why the material type is the factor that directly affects resistance. Insulation thickness, color coding, and shielding don’t change the resistance of the conducting path itself. Insulation mainly influences thermal limits and voltage rating, color coding is just for identification, and shielding affects electromagnetic interference rather than the metal’s resistance.

Wire resistance is set by the material’s resistivity, the length of the conductor, and its cross-sectional area (with temperature also playing a role). The type of conductor determines resistivity—different materials, like copper and aluminum, have different intrinsic abilities to resist current. Even if the wire looks the same shape, the material itself will yield different resistance values because of that resistivity difference. That’s why the material type is the factor that directly affects resistance.

Insulation thickness, color coding, and shielding don’t change the resistance of the conducting path itself. Insulation mainly influences thermal limits and voltage rating, color coding is just for identification, and shielding affects electromagnetic interference rather than the metal’s resistance.