来源:学生作业帮 编辑:搜搜考试网作业帮 分类:物理作业 时间:2024/08/06 15:52:42
大学电路分析题怎样做啊!
![](http://img.wesiedu.com/upload/c/fa/cfa4fdb56499a93939499536ab6a16e0.jpg)
![](http://img.wesiedu.com/upload/f/cc/fccbd0ad2d0a7d579af7233c29ad484e.jpg)
只求一个未知数,用戴维南定理方便,如图,通过12Ω 的电流是两个网孔电流之和:
U1 = 2 * 6 = 12 V
(I1 + 2) * 12 + 4 * I1 = 40
I1 = 1 A
Uab = U1 - 4 * I1
= 12 - 4
= 8 V
Rab = 12 // 4 + 6
= 9 Ω
IL = Uab / (Rab + 1)
= 8 / 10
= 0.8 A
PL = IL * IL * RL
= 0.64 W