四、如圖(四)之電路中,R1 = R2 = R3 = 10 Ω,若施加電壓 vs = 8 V,試求由負載62b125cf0bcba.jpg端所看到的諾頓(Norton)等效電路圖,並需註明等效電路圖中之元件數值。62b125952e4ac.jpg