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: Kirchhoff's Rule Queston

  1. Jan 29, 2015 #1
    1. The problem statement, all variables and given/known data

    Consider the circuit above. You are given the following measured values:
    V = 1.5 V
    R1 = 100 omegacap.gif
    R2 = 100 omegacap.gif
    R3 = 50 omegacap.gif
    R4 = 50 omegacap.gif
    R5 = 50 omegacap.gif

    2. Relevant equations
    Kirchhoff's Loop Rule and Junction Rule

    3. The attempt at a solution

    I tried setting this up using the junction and loop rule.
    At the first junction (between R1 and R3), I have I1 = I2 + I3. At the second junction, after R5, I have I5 + I2 = Io (Io is the current entering the battery again).
    I do not understand what the loop rule should be written as and then how to put it all together. Please help!
  2. jcsd
  3. Jan 29, 2015 #2


    User Avatar
    Homework Helper

    Your I5 and I3, and also Io and I1 are related - how?

    What does the Loop Rule state?
  4. Jan 29, 2015 #3
    The loop rule states that the sum of the potential differences around the circuit is 0. Is I3 = -I5? And also I1 = -Io?
  5. Jan 30, 2015 #4


    User Avatar
    Homework Helper

    The loop rule states that the sum of potential differences is zero around a loop.

    I3 = - I5 would mean that the current flows into R4 from both sides and the charges accumulate there. Is it possible? The current flows through a resistor, enters at one terminal and leaves at the other. What do you know about the current flowing through resistors connected in series?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted