U31A U12 31 W31Y R23 U23A W23Y △接：用电压表示电流 Y接：用电流表示电压 i1A=u12AR12-31AR31 W12Y=RYRY i2A=u234/R23-L12A/R12广(I) uz3y=Rziy-Rjisy(2) 3A=431A/R31-W23AR23 ily+izy+iay=0 Y᧕: ⭘⭥⍱㺘⽪⭥঻ u12Y=R1 i1Y–R2 i2Y '᧕: ⭘⭥঻㺘⽪⭥⍱ i1Y+i2Y+i3Y = 0 u23Y=R2 i2Y – R3 i3Y i3' =u31' /R31 – u23' /R23 i2' =u23' /R23 – u12' /R12 i1' =u12' /R12 – u31' /R31 (1) (2) R31 R12 R23 i2 ' i3' i1' 1 3 2 — _ _ + + + u31' u23' u12' R1 R3 R2 i1Y i3Y i2Y 1 3 2 — — + — + + u31Y u23Y u12Y