The resistivity of copper ρ=0.0 175 (unit: ωmm? /m)

Assume that the cross-sectional area of copper wire is s (unit: mm? ), the length is l (unit: m),

Then the resistance r of this wire is: r = ρ l/s.

Known: S= 1.5mm? L = 100 m

Substituting the above formula, there are:

r = 0.0 175(ωmm？ /m)× 100(m)/ 1.5(mm？ )=7/6(Ω)≈ 1. 1667Ω

But the above calculation is for reference only.

In actual calculation, parameters such as temperature, number of strands of copper wire, material purity of copper wire, frequency of current, etc. It should also be considered.