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!

Need help with Parallel circuits

  1. Sep 5, 2010 #1

    fcb

    User Avatar

    1. The problem statement, all variables and given/known data

    27zztrc.png
    2. Relevant equations

    V=IR and What not

    3. The attempt at a solution

    I have attempted it many different ways
    I need your help, I have preliminary exams coming up, Please do me a favour.

    Regards, FCB
     
  2. jcsd
  3. Sep 5, 2010 #2

    rl.bhat

    User Avatar
    Homework Helper

    Show at least one attempt.
     
  4. Sep 5, 2010 #3

    fcb

    User Avatar

    ok so we have 5 ohm and 20 ohm , in parallel, which are both in series with 50ohm

    now for equivalent resistance in parallel

    1 / R eq= 1/R1 + 1/R2

    ie R eq= R1 * R2 / ( R1+R2)

    therefore we have ( 4ohm in series with 50 ohm)

    then R eq= 54ohm ( add them when in series )

    then apply v=IR to get total current in circuit

    I= V/R
    = 12 / 54

    now when this current gets to the section where it splits in two, the current is divided and the majority of current goes throguh the least resistance

    current through 5ohm = 20 / ( 25) * 12 / 54
    current through 20ohm = 5 / ( 25) * 12/54
     
  5. Sep 5, 2010 #4

    rl.bhat

    User Avatar
    Homework Helper

    Your calculations are correct.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Need help with Parallel circuits
Loading...