# RLC Circuit

Discussion in 'Homework Help' started by sb1370, Jun 3, 2013.

1. ### sb1370 Thread Starter New Member

Jun 3, 2013
2
0
Last week I took my semester Electric Circuit exam. I stuck with a question. I attached its picture below.
It asked the voltage difference between both sides of the switch at t=1.
I tried to solve it but the answer I found was from first-order which I think it's wrong. May you explain it?

• ###### RLC1.png
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Last edited: Jun 3, 2013
2. ### WBahn Moderator

Mar 31, 2012
17,443
4,698
You need to show your best effort at solving the problem so that we can see where you are going right and where, if anywhere, you are going astray.

Since you haven't labeled your diagram but think that this is sufficient for us to answer your question, I'm guessing that your work on the exam didn't amount to much. If so, that's fine. But now you have the time needed to make a more serious effort.

When you say you want the voltage at t=1, t=1 what? 1 second? 1 day? 1 microsecond? 1 month? Units matter.

3. ### sb1370 Thread Starter New Member

Jun 3, 2013
2
0
I wasted at least 40 minutes for it at the exam.
t=1 means at the equation put t equals 1. t=1 second.
As far as I remember the answer equation I found was something like Ae$^{Bt}$-Ce$^{Dt}$. A,B,C,D are coefficients.
If the answer isn't from first order then tell me to solve it again.

4. ### WBahn Moderator

Mar 31, 2012
17,443
4,698
Okay. Solve it again.

It's inherently a second-order system.