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!

Kirchoffs rule question

  1. Jul 27, 2014 #1
    this is a rough diagram of the picture, please note the direction of the current. that is what is throwing me off right now. The answer I get for I3 is 8.2 ohms and that seems a bit unrealistic to me.
    the question is
    a) what is the magnitude of the current in each resistor
    b) what are the directions of the current in each resistor

    thanks in advance!
     

    Attached Files:

    Last edited: Jul 27, 2014
  2. jcsd
  3. Jul 27, 2014 #2

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    Well, apart from the picture being impossible to interpret, the answer simply cannot be 8.2 ohm as currents are measured in ampere.

    Otherwise it should be a simple matter of applying Kirchoff's laws. Assume a current for each resistor and see where it takes you. If you write down how you arrive at your result, it will be easier to see if and where you go wrong.
     
  4. Jul 27, 2014 #3
    I meant Amps, sorry. Even though, it seems like a very large number. Also, I uploaded a picture of the circuit so it can be interpreted.
     
  5. Jul 27, 2014 #4

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    So, what relations have you obtained from Kirchoff's laws?
     
  6. Jul 27, 2014 #5

    Drakkith

    User Avatar

    Staff: Mentor

    Just FYI, I deleted several posts to clean the thread up.
     
  7. Jul 27, 2014 #6
    This is what I have so far
     

    Attached Files:

  8. Jul 27, 2014 #7

    Orodruin

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper
    Gold Member

    You may want to reconsider your application of the current law. Which currents go into the point and which go out?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Kirchoffs rule question
  1. Kirchoff's Rules (Replies: 1)

  2. Kirchoff's Rules (Replies: 5)

  3. Kirchoff rule (Replies: 1)

  4. Kirchoff's Rules (Replies: 13)

Loading...