What voltage should be applied to a lead wire 2m long so that the current in the conductor is 2A.

What voltage should be applied to a lead wire 2m long so that the current in the conductor is 2A. Wire cross-sectional area 0.3 mm (2)?

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

Constants: ρ (resistivity of lead) = 0.21 Ohm * mm2 / m.

And Ohm’s law for the chain section: U = I * R, where R = ρ * l / S.

The formula for the calculation will be: U = I * ρ * l / S.

Let’s perform the calculation: U = 2 * 0.21 * 2 / 0.3 = 2.8 V.

Answer: To obtain a given current strength, a voltage of 2.8 V must be applied to the conductor.