What voltage must be applied to a lead wire 2 m long so that the current in the wire is 2 A?

What voltage must be applied to a lead wire 2 m long so that the current in the wire is 2 A? Wire cross-sectional area 0.3 mm2

Initial data: l (lead wire length) = 2 m; I (required current strength) = 2 A; S (cross-sectional area of lead wire) = 0.3 mm2.

Reference data: ρ (lead resistivity, n.o.) = 0.21 Ohm * mm2 / m.

1) Let’s calculate the resistance of the lead wire: R = ρ * l / S = 0.21 * 2 / 0.3 = 1.4 Ohm.

2) Determine the voltage that needs to be applied to the wire: U = I * R = 2 * 1.4 = 2.8 V.

Answer: A voltage of 2.8 V must be applied to the lead wire.