Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Equivalent Resistance

  1. Mar 1, 2008 #1
    1. The problem statement, all variables and given/known data
    Find equivalent resistance in:
    http://img135.imageshack.us/img135/585/62083770ay3.jpg [Broken]

    2. Relevant equations

    3. The attempt at a solution
    r_eq^-1 = (30+60)^-1+(40+10)^-1
    this is wrong.
    do i need to include 8 and 4 ohm resistors
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Mar 1, 2008 #2


    User Avatar
    Science Advisor

    Based on your drawing your equation looks correct. What answer did you get?

    You can check your answer against this equation's results:

    [tex]R_{eq} = \frac{R_1 \cdot R_2}{R_1 + R_2} [/tex]

    R1 would be 90 since 30 and 60 are in series and R2 would be 50 for the same reason.

    Last edited by a moderator: May 3, 2017
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook