Determinant is the specific resistance of the material of the conductor if at a voltage at the ends

Determinant is the specific resistance of the material of the conductor if at a voltage at the ends of the conductor of 0.85 V, the current in it is 8 A. The length of the conductor is 25 m, the cross-sectional area is 4 mm ^ 2.

Task data: U (voltage at the ends of the conductor) = 0.85 V; I (current flowing in the conductor) = 8 A; l (length of the taken conductor) = 25 m; S (cross-sectional area) = 4 mm2.

1) Calculation of the resistance of the conductor: R = U / I = 0.85 / 8 = 0.10625 Ohm.

2) Calculation of the resistivity of the conductor material: R = ρ * l / S and ρ = R * S / l = 0.10625 * 4/25 = 0.017 Ohm * mm2 / m.

Answer: The conductor is made of copper, the specific resistance of which is 0.017 Ohm * mm2 / m.