What is the current through Resistor on RC circuit

  • Thread starter MeMoses
  • Start date
  • #1
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Homework Statement



The diagram below depicts an RC-circuit where C = 1.70 μF, R1 = 18.0 Ω, R2 = 10.0 Ω, and V0 = 2.0 V.
a.) What is the current through R1 immediately after the switch S is closed?
b.) What is the current through R2 after the switch S has been closed for a very long time? Assume that the battery does not go dead.

Homework Equations


I=E/R


The Attempt at a Solution


I got part A. I divided 2V by 18Ω to get 0.111A which is correct. I know when the switch is initially closed current flows through the capacitor and when it is charge current no longer flows through. I figured part B you would just find the current through 2/(18+10)=0.0714 which turned out incorrect so I'm not sure what to try next. Also I don't think the capacitance is relevant, so I hope I'm not wrong there. Any help would be great
 

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Answers and Replies

  • #2
gneill
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Your method and current value looks correct. Do they want any particular units, notation, or significant figures in the answer format?
 
  • #3
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It looks like I forgot to enter the 0 after the decimal. Well, thats embarassing
 
  • #4
gneill
Mentor
20,829
2,807
It looks like I forgot to enter the 0 after the decimal. Well, thats embarassing
Been there, done that :smile:
 

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