(2)等效电阻 li RIR R R,"等数 由KCL: i=i1+i2+…+ik+….+in =/R1+WR2+…+un=(1R1+1/R2+.…+1/Rn)=Gc G=1/R为电导G=G1+G2+…+Gn=∑G>G 等效电导等于并联的各电导之和 G R RR 即R<R R (以理步交通大学等效 由KCL: i = i1+ i2+ …+ ik+ …+in =u/R1 +u/R2 + …+u/Rn=u(1/R1+1/R2+…+1/Rn )=uGeq G =1 / R为电导 (2) 等效电阻 + u _ i Req 等效电导等于并联的各电导之和 in R1 R2 Rk Rn i + u i1 i2 ik _ k n k Geq = G + G + + Gn = Gk  G =1 1 2  eq k n eq eq R R R R R G R = = + + + 即  1 1 1 1 1 2 