三、考慮如圖(三)之電路中,R1 = R2 = R3 = 10Ω,流控電壓源(Current Controlled Voltage Source, CCVS)的轉換電阻 r = 5 Ω,若施加直流電壓 vs = 8 V,請繪出由負載 RL 端所看到的諾頓(Norton)等效電路。(25 分)