1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Problem 1 on current electricity

  1. Aug 10, 2010 #1
    1. The problem statement, all variables and given/known data

    the problem is attached to this post

    2. Relevant equations

    Req=1/R1+1/R2+..... for parallel and Req.=R1+R2+... for series... Kirchoff's law for Current and Potential to be applied

    3. The attempt at a solution
    completely lost ... pls help
     

    Attached Files:

    • p1.JPG
      p1.JPG
      File size:
      9.2 KB
      Views:
      105
  2. jcsd
  3. Aug 10, 2010 #2
    First you need to find current and voltage across [itex]R_{2}[/itex] as a function of time. Then you can find the generated heat by using the formula

    [tex]W_{2}=\int^{\infty}_{0}V_{2}(t)I_{2}(t)dt,[/tex]

    where [itex]V_{2}[/itex] and [itex]I_{2}[/itex] are the voltage and current across resistor [itex]R_{2}[/itex]. As you see, time goes from 0 to infinity (when the capacitor is fully charged).
     
  4. Aug 10, 2010 #3
    can u give me the answer???
     
  5. Aug 10, 2010 #4
    It's against the policy! You need to show some effort first.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Problem 1 on current electricity
Loading...