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!

Electric Circuits Question!

  1. Aug 31, 2011 #1
    1. The problem statement, all variables and given/known data
    What is the value of resistance R in the figure, if the current through the battery is 5.0A?


    2. Relevant equations
    V=IR
    Rt = (1/R1 + 1/R2)^-1 + R3


    3. The attempt at a solution
    Rt = V/I
    Rt = 2V/5A
    Rt = 0.4ohms

    0.4 = (1/0.5 + 1/R)^-1 + 0.1
    R = -5 ohms

    (the answer given is 0.750 ohms)
     

    Attached Files:

    • 22.png
      22.png
      File size:
      2.9 KB
      Views:
      49
  2. jcsd
  3. Aug 31, 2011 #2
    Everything looks correct down to and including 0.4 = (1/0.5 + 1/R)^-1 + 0.1

    I started from that point and got the correct answer. Check your arithmetic again.
     
  4. Aug 31, 2011 #3
    oh yeah haha you're right, I messed up in my algebra, thanks!
     
  5. Aug 31, 2011 #4
    if you could, please take a look at my other quetsion here: https://www.physicsforums.com/showthread.php?p=3478610#post3478610 [Broken]
     
    Last edited by a moderator: May 5, 2017
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Electric Circuits Question!
Loading...