Find the resistance of a copper conductor with a length of 80 m and a cross-sectional area of 17 mm2.

The resistance of a given copper conductor can be calculated using the formula:
R = ρ * l / S, ρ is the resistivity of the copper conductor (ρ = 0.017 Ohm * mm ^ 2 / m = 0.017 * 10 ^ -6 Ohm * m), l is the length of the copper conductor (l = 80 m), S – cross-sectional area of a copper conductor (S = 17 mm ^ 2 = 17 * 10 ^ -6 m ^ 2).
Then: R = ρ * l / S = (0.017 * 10 ^ -6) * 80/17 * 10 ^ -6 = 0.017 * 80/17 = 0.08 Ohm.
Check: Ohm = Ohm * m * m / m ^ 2 = Ohm * m ^ 2 / m ^ 2 = Ohm.
Answer. The resistance of the copper conductor is 0.08 ohms.