基本電學 問題 - 考試
By Caroline
at 2013-11-12T18:19
at 2013-11-12T18:19
Table of Contents
[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
題目:http://ppt.cc/~mo8
已知v(t)振幅10V、頻率1K Hz,電阻器的電壓相位領先電壓源v(t)達30度,求電容器上電
壓的振幅為?
這題的答案是5V,而我的想法是:http://ppt.cc/q-SE
1.tan-1(Vc/Vr)=30度,所以Vc=0.58Vr
2.因為弳長=10,所以(Vr平方+Vc平方)開根號=10,得Vr=8.66
3.我知道答案錯了,但搞不大懂錯在哪,請各位高手幫忙,謝謝!
--
題目:http://ppt.cc/~mo8
已知v(t)振幅10V、頻率1K Hz,電阻器的電壓相位領先電壓源v(t)達30度,求電容器上電
壓的振幅為?
這題的答案是5V,而我的想法是:http://ppt.cc/q-SE
1.tan-1(Vc/Vr)=30度,所以Vc=0.58Vr
2.因為弳長=10,所以(Vr平方+Vc平方)開根號=10,得Vr=8.66
3.我知道答案錯了,但搞不大懂錯在哪,請各位高手幫忙,謝謝!
--
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考試
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