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!

Circuit Analysis

  1. Oct 31, 2009 #1
    I had a simple circuit analysis question and the picture describes everything; I'll restate the questions just in case if you can't read it.

    Find the Req seen from nodes bc, which are the nodes above and below the potential source.
    Find the current, i. That is the current enters the potential source from above.
    Find Vx, that is the V across the 10 ohm resistor that is parallel with the 4 and 6 in the left bottom mesh.

    Let's see who's trading trick or treating with a circuitry problem.

    http://img202.imageshack.us/img202/585/dsc02764n.jpg [Broken]


    http://img202.imageshack.us/img202/585/dsc02764n.th.jpg [Broken]
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Oct 31, 2009 #2
    my results were Vx = 20 V
    Req = 2.079 ohms
    i = 4 A

    I'm not sure if they are correct though.
     
  4. Oct 31, 2009 #3

    MATLABdude

    User Avatar
    Science Advisor

    For what it's worth, my answers are the same, except for the current supplied by the voltage source. Really, this is a simple, simple circuit once you get through realizing which branches are in parallel (and simplifying them, of course).

    Note that the voltage source is hooked up between terminals B and C. If you've learned Thevenin's equivalent, you know that you can reduce all the resistances to a black box. If not, note that you found the resistance [itex]R_{BC}[/itex], the resistance seen by anything hooked up between terminals B and C.
     
  5. Nov 1, 2009 #4
    vx cant be 20 because it's not parallel to the potential source. the value of vx i found was 8.71 and i was 9.61 is this what you came up with?
     
  6. Nov 1, 2009 #5

    MATLABdude

    User Avatar
    Science Advisor

    Oops! I totally misread your response! I got the value of [itex]V_{x}=V_{AC}=11.4 V[/itex] However, I also got the current to be 9.61 A (with some lost numbers as a result of not carrying forward calculations).
     
    Last edited: Nov 1, 2009
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Circuit Analysis
  1. Circuit Analysis (Replies: 4)

  2. Circuit Analysis (Replies: 6)

  3. Circuit Analysis (Replies: 5)

  4. Circuit Analysis (Replies: 7)

  5. Circuit analysis (Replies: 1)

Loading...