[課業] 相依電源求戴維寧等效疑問
題目與自己解法:https://imgur.com/a/iWcHY
如圖,我是先用節點電壓法求出Vx=7.5
在帶入送V送I的方程式裡
最後算出來的Rth=40
但答案是-10,不知哪邊觀念錯了?
另外想問電阻值可以是負值嗎?好像怪怪的
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 1.171.9.33
※ 文章網址: https://www.ptt.cc/bbs/Examination/M.1502601460.A.8B4.html
推
08/13 13:45, , 1F
08/13 13:45, 1F
→
08/13 13:45, , 2F
08/13 13:45, 2F
推
08/13 13:58, , 3F
08/13 13:58, 3F
推
08/13 14:16, , 4F
08/13 14:16, 4F
→
08/13 14:16, , 5F
08/13 14:16, 5F
推
08/13 15:54, , 6F
08/13 15:54, 6F
推
08/13 17:43, , 7F
08/13 17:43, 7F
推
08/13 21:12, , 8F
08/13 21:12, 8F