14.如圖所示,若化簡為戴維寧等效電路,a、b 兩點之等效電阻 Rth 及等效 電壓 Vth 為多少?(台糖 112)
(A)Rth = 5Ω(B)Rth = 10Ω(C)Vth = 4V(D)Vth = 8V