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Homework Help: Label a Nodal Voltage

  1. Oct 18, 2014 #1
    1. The problem statement, all variables and given/known data
    Find V1 and V2 by Nodal Analysis


    2. Relevant equations

    3. The attempt at a solution
    In order to find V1 and V2, I will have to define voltages at node 1 and node 2 as Vx and Vy, so that when I apply KCL at node 1, I will get:

    (Vx-240)/3 + (Vx-Vy)/6 + 10=0

    While there is a 30 Ohm resistor at node 2 where I can label the voltage Vy, where should I label the voltage Vx when there is no element? Is this the right way to label the voltage Vx:


    And if it is the right way, what is the logic?
  2. jcsd
  3. Oct 18, 2014 #2


    User Avatar
    2017 Award

    Staff: Mentor

    I would draw an arrow and label that, but yes, this is the right approach if you want to reference your Vx to the lower node (a good choice).
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