R44+R53-l1 R 3 +R1=0(1) R4 B R66 Ri-ri tu C 2 RSis=0 (2)IR R R33+R66 +R4i4=0(3) 回路 ABCDA D Ri,-ri-ri tu s2Z +Ri,=0 (1)+(2)(1) (2) 0 4 4 6 6 2 2 2 1 1 1 + − R i − R i − R i + u s − u s + R i = 回路ABCDA R 1+ us1- B R 2+us2- A C R 5 R 4 R 6 R 3 D i 1 i4 i6 i3 i5 i 0 ( 3 ) 2 4 4 3 3 6 6 + = +R i R i R i 0 ( 1 ) 1 1 4 4 5 5 1 + = − + − R i R i R i u s 0 ( 2 ) 5 5 6 6 2 2 2 − = − − + R i R i R i u s