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R=ρ*l/s
ρ=10^-7 Ω*m - rezystancja właściwa żelaza
s=1,5mm²=1,5*10^-6 m²
R=10^-7 Ω*m * 0,3m / (1,5*10^-6 m²)=0,02Ω
U=I*R=1A*0,02Ω=0,02V=20mV