1 S断开 U0=220×0.1×0.45=9.9VIL=9.9÷5=1.98mAS闭合 U0=220×0.1×1.44=31.68VIL=31.68÷5=6.336mA2 U2=4.5÷0.45=10Vn=220÷10=22IL=10×1.44÷5=2.88mA
