戴維寧定律 - 考試
By Poppy
at 2013-04-30T13:00
at 2013-04-30T13:00
Table of Contents
※ 引述《dokeo (鏡)》之銘言:
: http://ppt.cc/YycE
: 請問這題的eth ,eth 該如何解..答案是eth40,rth8
: 但Eth我觀念很差,怎麼都算不出40..所以有勞各位大哥的幫忙
先把7拿掉
把 2歐姆 3歐姆 6歐姆 連接的節點設為V
(1/3+1/6) V = 6/3 + 12/6 + 4
V = 16
再把 a點 設為 Va
b點 設為 Vb
(Va-16)/2 = 4
Va = 24
Vb/4 = -4
Vb = -16
Vab = 40
Rth = 2 + 3//6 + 4 = 8
--
: http://ppt.cc/YycE
: 請問這題的eth ,eth 該如何解..答案是eth40,rth8
: 但Eth我觀念很差,怎麼都算不出40..所以有勞各位大哥的幫忙
先把7拿掉
把 2歐姆 3歐姆 6歐姆 連接的節點設為V
(1/3+1/6) V = 6/3 + 12/6 + 4
V = 16
再把 a點 設為 Va
b點 設為 Vb
(Va-16)/2 = 4
Va = 24
Vb/4 = -4
Vb = -16
Vab = 40
Rth = 2 + 3//6 + 4 = 8
--
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