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Homework Help: Electricity and Kirchhoff's Laws

  1. Sep 29, 2012 #1
    1. The problem statement, all variables and given/known data

    Given two batteries in parallel, one of 10V and 5Ω, and the other of 5V and 2Ω, which is attached to a 3Ω resistor, find the current that flows from the 10V battery, if the system described above is connected to a 20 resistor.

    2. Relevant equations

    Kirchhoff's two laws : (1) Current entering a junction = current leaving junction, (2) Algebraic sum of emfs = sum of all potential drops;

    V = IR

    3. The attempt at a solution

    I think I used the laws correctly, and ended up with a final answer of 1.56 A. My attempt is attached below (the 2nd photo).

    Thing is, I'm not sure if this is correct...

    Attached Files:

  2. jcsd
  3. Sep 29, 2012 #2


    User Avatar

    Staff: Mentor

    Your solution looks fine.
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