![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/1ad5ad6eddc451da42d23413befd5266d0163225?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
将 S转换为Ω,设 i ,各支路电流如图,
8i=-U1,U1=2(4+i+2U1)+5(4+i)=28+7i+4U1
-3U1=28+7i,17i=28,i=28/17,
Uab=5(4+i)=20 + 140/17=28.24v。
4A电流源置开路,外加电源 u'',流入电流 i'',设 i,
![](https://video.ask-data.xyz/img.php?b=https://iknow-pic.cdn.bcebos.com/58ee3d6d55fbb2fb5c4062ea474a20a44723dcda?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto)
U1=8i,
U1-2(2U1-i)=5i"-5i,-3U1+2i+5i=5i",-17i=5i",i=-5i"/17,
Rab=U"/i" =(5i"-5i)/i"=5+ 25/17=110/17 欧。
戴维南等效电路为Uab串Rab开口端a,b。
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