基本電學 - 考試
By Isabella
at 2014-06-13T16:21
at 2014-06-13T16:21
Table of Contents
http://ppt.cc/j65o
題目 問答第2題
這題 題目要求電路i(t)為何
他給定的v(t)= 100cos(1000t + 30度) V
總阻抗 Z=(5-j5) // (5+j5) = 5歐姆 這邊沒問題
我求的i(t) = v(t) / 5 = 20cos(1000t + 30度) A (我直接用瞬時值除以5歐姆
^^^
這樣不知可不可以?)
而他題目的解法是 (50√2 <30度)
I = -------------- = 10√2 <30度
5
題目的解答 i(t) = 20sin(1000t + 30度)
^^^
(可是題目的v(t)函數是cos為何i(t)就變成sin)
( v(t) 跟 i(t) 不是沒有角度差嗎? )
不懂
請各位大大幫我解惑謝謝!!!!!!
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