计算铜线的电阻
6mm2的铜护导线75米,按国标计算单根电阻应是多少?谢谢啦!
ρ铜=1.678*10^-8Ω.M,L=75M,S=6MM^2=6*10^-6M^2 R=ρ铜*L/S=0.20975Ω
R=ρ铜*L/S=1.7*10^(-8)*75/6*10^(-6)=0.2125Ω
R=ρ铜*L/S =0.017*75/6 =0.2125Ω
0.0175*75/{派*[(3*0。001)的2次方]}
β铜≈0.017 6mm2=6*10^-6m2 R=βl/s=0.017*75m/(6*10^-6m2)=212500Ω
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