两个例子看看吧：串联：电流处处相等,电压分压.I1＝1A   I2＝1A   I＝1AI＝I1＝I2U1＝1V  U2＝2V  U＝3VU＝U1+ U2R1＝1Ω   R2＝2Ω &...