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    14.素養(4)
1 如圖所示電路,由 a、 b 兩端看入之諾頓等效電流源 IN及等效電阻 RN 分別為何? 111 統測
A IN = 5 A, RN = 3 Ω
B IN = 5 A, RN = 6 Ω
C IN = 2 A, RN = 3 Ω
D IN = 2 A, RN = 6 Ω

求 RN,先將電壓源短路,電流源斷路, RN = 18 // 9 // 6 = 3Ω

求 IN 時,先將 a b 兩點短路,IN = 流過 a b 兩點短路的電流

6Ω電阻被短路

先看 18V

IN1 = 18 / (18//9) = 18/6 =3A

再看 2A

IN2 = 2A (電阻都被短路了)

IN = 3+2 =5A