What is the electrical resistance of a copper conductor 100 m long with a cross-sectional area of 0.2 mm2?

We calculate the resistance of a copper conductor using the formula:
R = ρ * l / S, where ρ is the resistivity of copper (we take ρ = 0.018 Ohm * mm ^ 2 / m), l is the length of the copper conductor (l = 100 m), S is the cross-sectional area of the copper conductor (S = 0.2 mm ^ 2).
Let’s calculate the resistance of a copper conductor:
R = ρ * l / S = 0.018 * 100 / 0.2 = 9 ohms.
Answer: The resistance of a copper conductor is 9 ohms.