RC Circuits: Calculating Voltage

  • #1
I've been trying to answer the following equation but I just can't get my head around it!

'calculate the time taken 't' for the voltage over capacitor array (Vc) to reach 80% of Vo, in terms of Vo, R, C1 and C2 (caps are in parallel)'



I know I need these two equations but I just don't know what to do with them:
Vc = Vo (1 - e^[-(t/tau)])
tau = R.C



I have tried solving it but I just doesn't make sense and there isn't an RC circuit calculator that I can check my answer with :(, anyways help would be fantastic, thanks
 

Answers and Replies

  • #2
gneill
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What is Vc/Vo when Vc reaches 80% of Vo?
 
  • #3
Hi there, in this part of the question, the values of Vc and Vo aren't given so I'm not too sure where to go from there
 
  • #4
gneill
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No matter what the actual value of Vc is, the ratio Vc/Vo is...?
 
  • #5
oooops sorry, the exact question I have is:

1) Consider the circuit in fig. 1
a) Derive the expression for the time taken for the p.d., Vc, across the capacitor array to reach 80% of Vo in terms of C1, C2, R and Vo
 
  • #6
gneill
Mentor
20,937
2,878
oooops sorry, the exact question I have is:

1) Consider the circuit in fig. 1
a) Derive the expression for the time taken for the p.d., Vc, across the capacitor array to reach 80% of Vo in terms of C1, C2, R and Vo

And again I ask you to consider what the statement "Vc across the capacitor array to reach 80% of Vo" implies for the ratio Vc/Vo.
 

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