A steel conductor with a length of 140 cm and a cross-sectional area of 0.2 mm2 flows a current of 0.25 A.

A steel conductor with a length of 140 cm and a cross-sectional area of 0.2 mm2 flows a current of 0.25 A. Determine the voltage at the ends of this conductor.

Let’s use the formula to find the resistance of the conductor: R = ρ * l / S, where ρ is the resistivity of the material, l is the length, S is the cross-sectional area.
R = 0.15 * 1.4 / 0.2 = 105 ohms.
According to Ohm’s law for a section of the circuit: U = IR where U is voltage, I is current, R is resistance.
U = 105 * 0.25 = 26.25 V.