模拟电路电线截面积和电流的估算公式10下5,100上2,25.35.四三界,75.90两倍半,穿管.温度八九折,铜线升级算,裸线加一半.10,100,25,35,75,90为线径.5,2,4,3,2.5,0.8,0.9为电流