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RC Circuit Transient Response

by dudforreal
Tags: circuit, transient
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gneill
#37
Oct1-11, 02:10 AM
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P: 11,675
Gotta go catch some zZ's now. I'll check back in the morning (my morning, that is).

dudforreal
#38
Oct1-11, 02:11 AM
P: 116
I think that my answer is wrong because when I used this equation on a different question with the same circuit with the voltage source being 4V, R1 = 1600, R = 2000 and C = 10n the answer I got was 0.798V but the correct answer is 1.4239V.
gneill
#39
Oct1-11, 09:44 AM
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P: 11,675
Good morning. (*YAWN*)

I took another look at the problem. A small correction is required to the time response formula.

This time the exponential is starting at zero and heading towards a final value that's equal to the Thevenin voltage of the resistor network. So the form is:
[tex] V_o(t) = V_{th} \left(1 - e^{-t/\tau} \right) [/tex]

Regarding your "different question with the same circuit", apply the above suggested formula and recheck your result -- also check to see if the time t1 to be plugged in is the same for both problems.
dudforreal
#40
Oct1-11, 08:45 PM
P: 116
ok cool i got the answer. Now for the second part of the question with the switch between the resistor and the voltage source, my answer for the time before and after 0 as 0V and it is going to -5(7500/17500) = -2.143V.
gneill
#41
Oct1-11, 09:19 PM
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P: 11,675
Quote Quote by dudforreal View Post
ok cool i got the answer. Now for the second part of the question with the switch between the resistor and the voltage source, my answer for the time before and after 0 as 0V and it is going to -5(7500/17500) = -2.143V.
Yes, that's what I see for that circuit.
dudforreal
#42
Oct1-11, 09:31 PM
P: 116
ok thanks i got the answer


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