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    14.素養(4)
1 如圖所示,則Rth、Vth分別為
A 250kΩ、9.6V
B 40kΩ、9.6V
C 40kΩ、2.4V
D 50kΩ、3V

看 Rth 等效電阻時,電壓源短路,如上圖

Rth = 200k // 50k = 40kΩ

看 Vth 等效電壓時,Vth = Va

Va = 12 × 50200k+50k = 2.4V