Calculating Current in RC Circuit with Closed Switch

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Homework Help Overview

The discussion revolves around calculating the current in an RC circuit immediately after a switch is closed. The circuit includes a capacitor and two resistors, with specific values provided for capacitance and resistance.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster considers using loop analysis and junction rules but expresses uncertainty about the approach. Other participants question the voltage across the capacitor immediately after the switch is closed, with some suggesting it may be zero due to the capacitor being initially uncharged.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. Some guidance has been offered regarding the voltage across the capacitor, but no consensus has been reached on the overall approach to finding the current.

Contextual Notes

Participants are navigating the implications of the capacitor being initially uncharged and the associated assumptions in the circuit analysis. There is a lack of clarity on the equations or methods that should be applied to solve the problem.

arl146
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Homework Statement


What is the current through R2 immediately after the switch S is closed?
C = 7.95x10^(-6) F , R1 = 27.5 Ohm , R2 = 10.5 Ohm , and Vo = 20.0 V


Homework Equations


I don't know what to use?


The Attempt at a Solution


I thought maybe I use two loops, the left and right and then a junction? I don't know if I have to do a matrix or what for this. Maybe I'm missing something simple here?
 

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Please help !
 
Something simple. What's the voltage across the initially uncharged capacitor immediately after the switch is closed?
 
gneill said:
Something simple. What's the voltage across the initially uncharged capacitor immediately after the switch is closed?

Well they say C= 7.95 x 10^(-6) F what is that number for? I don't know.. :(
if it is uncharged is it just zero ?
 
Oh, okay, I got it. It's just zero then. Thanks :D
 

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