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: Using Kirchhoff's Laws to find current in a circuit

  1. Nov 2, 2005 #1
    I have attached a picture of a circuit. I am trying to find the values of I1, I2, and I3. What I have come up with so far, using Kirchhoff's Voltage and Junction Laws is:
    for the left loop:
    9V - (5 ohms)I1 -4V - (10 ohms)I2 = 0
    which simplifies to:
    1V - (1 ohm)I1 - (2 ohms)I2 = 0
    for the right loop:
    14V - (10 ohms)I3 -4V - (10 ohms)I2 = 0
    which simplifies to:
    1V - (1 ohm)I3 - (1 ohm)I2 = 0
    I am pretty certain that I have these correct, but I can't seem to solve my system of equations--whenever I try to add or subtract the equations, several terms cancel, leaving me with a current equaling zero.
    I would really appreciate some help. Thank you. :!!)

    Attached Files:

  2. jcsd
  3. Nov 3, 2005 #2


    User Avatar
    Homework Helper

    Answered in "introductory Physics" forum.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook