铜排是优良的导电体,其电阻值是极低的。以常见的25X3,30X3,30x4,40X4,40X5,50X5,60x5,60X6,60X8,60X10的铜排为例,其1米的电阻分别为0.233毫欧,0.194毫欧,0.146毫欧,0.109毫欧,0.0875毫欧,0.07毫欧,0.0583毫欧,0.0486毫欧,0.0365毫欧和0.0192毫欧。