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[考題] 基本電學 問題
Oct 14th 2013, 10:32, by Douglass

作者Douglass (^___^)

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標題[考題] 基本電學 問題

時間Mon Oct 14 10:32:35 2013

[考題] 國考歷屆考題與考題觀念討論(書裡看到的選這個)請附上想法、出處 考題:http://ppt.cc/dxJv 如圖,書本解法是把左邊電壓源&電阻轉換成電流源&電組並聯後,以密耳門定理去求解。 我有疑問的是:不能把右邊電流源及電阻(2R)先轉成串聯再求解嗎? 2A與2R算出4V(+向上),所以總電阻是6R、總電壓12V,算出電流是2A,我知道這算法錯了 ,但不知錯在哪,請高手解答,謝謝! -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 42.74.34.48

jdtrue:不可以 你做戴維寧或諾頓等效之後,得到的電路是對剩餘電路 10/14 10:41

jdtrue:的等效,也就是拔掉的那兩個點看進去的電路,而你要求的那 10/14 10:43

jdtrue:根電阻跟等效之後的2歐姆電阻是兩碼子事,總之叫你求哪一根 10/14 10:45

jdtrue:電阻的行為 那一根電組絕對不可隨便就把他換掉,不會相等的 10/14 10:46

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