1. Limited time only! Sign up for a free 30min personal 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!

Homework Help: Basic Circuits - Equivalent Resistance

  1. Jan 12, 2009 #1
    1. The problem statement, all variables and given/known data

    Find the Resistance between terminals B-C, B-D
    2. Relevant equations

    3. The attempt at a solution

    The book says that the 2 80-ohm resistors are in parallel for terminals A-B, and the answer for B-C=90ohms, B-D=85ohms. I don't quite understand why this is. Is it because the 2 80ohm resistors are in series between terminals B-C and B-D, and therefore it short circuits because the other path (wire only) is 0 ohms? Does this mean that whether the resistors are in series or parallel depends on the path taken?
  2. jcsd
  3. Jan 12, 2009 #2


    User Avatar

    Staff: Mentor

    Correct about the short circuit around the 80 Ohm resistors for the path B-C and B-D.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook