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d=3mm
d=2r
r=1,5mm
s=πr²
s=3.14*(1.5)²=3.14*2.25=7.065mm²=7.065*10do-6m²
R=ro*l/s
R=9,7 *10do-8*(1000/7.065*10do-6)=9.7*10do-2(1000/7.065)=1373*10do-2=13.78oma
l=1km=1000m
d=3mm
ρ=9,7*10^-8
s=π*d²/4=π*3²/4=mm²=7*10^-6m²
R=ρ*l/s=9,7*10^-8*1000/7*10^-6=13,86Ω