First order RC Circuit Table problem

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Homework Help Overview

The discussion revolves around a first-order RC circuit problem where participants are tasked with filling out a table based on node analysis and time constants. The problem involves determining values for current and voltage at specific time intervals, specifically during charging and discharging phases.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate initial current and voltage values but questions the correctness of their answers. Some participants question the clarity of the time intervals involved in the problem, suggesting that the poster needs to specify which interval is being analyzed.

Discussion Status

The discussion is ongoing, with participants exploring the implications of different time intervals on the calculations. Some guidance has been offered regarding the need to clarify assumptions about the time constant in relation to the switching interval.

Contextual Notes

The problem requires the completion of a table for both charging and discharging intervals, but the original poster has not clearly indicated which interval they are currently addressing.

k31453
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Homework Statement


Hi I got this problem and have to fill out this table.
Untitled.png


4ea18d02-8e1f-4015-9006-64e73a38f53d-original.png


Homework Equations



node analysis
time constant = RC
ic(t)= C dVc(t)/dt


The Attempt at a Solution



I got few answers which i worked it out.

i (0-) = 0

Vc(0-) = 1.84

Vr(0-) = i (0-) * 10000

i (0+) = 0

Vc(0+) = 3.16

Vr(0+) = i (0-) * 10000



Am i right so far?
I don't know rest of them. the last column i know i have to use node analysis for that.
 
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The problem description mentions two separate time intervals, a charging interval and a discharging interval. You haven't stated which interval is in play for the determination of the table values.
 
I understand but that's what it said... complete table 1.
 
gneill said:
The problem description mentions two separate time intervals, a charging interval and a discharging interval. You haven't stated which interval is in play for the determination of the table values.

I understand but that's what it said... complete table 1.
 
k31453 said:
I understand but that's what it said... complete table 1.

Okay, so pick one of the intervals and state which one you've chosen (somehow I suspect that they want you to fill out the table twice, once for each interval...).

Hint: Before you make assumptions about Vc(0-) be sure to compare the time constant of the circuit to the given switching interval.
 

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