正孩稳态电路的计算 节点法: joL R n2 R R; Un=Us R 1++0 R+joL R2 R3 -1=0 R, R (1++joc0n=-i, RR 节点法 : S I + _ R 1 R 2 R 3 R 4 j L c j 1 − U S U n 1 U n 2 U n 3 U n U S = 1 1 2 3 2 1 2 3 3 1 1 1 1 1 ( ) 0 U U U n n n R R j L R R R − + + + − = + 1 2 3 3 3 4 1 1 1 ( ) n n n S j CU U j C U I R R R − − + + + = −