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Homework Help: Thevenin based question - Mesh circuit

  1. Aug 24, 2010 #1
    1. The problem statement, all variables and given/known data

    First post here... Sorry it has to be a question.

    I'm currently studying electrical engineering at university. Anyway, I've hit a couple of these mesh type circuits in my workbook and have no idea how to tackle them?

    The question asks to solve using Thevenin's Theorem, but they look completely different to our worked examples and I'm at a loss as to where to begin, let alone solve the questions!

    2. Relevant equations

    Here is one of the questions -


    Given: E1 = 200 V;
    R1 = 15 Ω; R2 = 20 Ω;
    R3 = 20 Ω; R4 = 12 Ω
    and RL = 27 Ω

    (a) Use Thevinin’s theorem
    to determine the value of
    current I.

    (b) Check you answer using
    Δ-to-Y transformation
    and Kirchhoff’s laws.

    3. The attempt at a solution

    Like I said, unfortunately I don't know where to begin with this :redface:

    Thanks in advance to anyone who can help me out here.
  2. jcsd
  3. Aug 24, 2010 #2

    The Electrician

    User Avatar
    Gold Member

    Have a look at this:

    http://kauko.hallikainen.org/rw/theory/theory6.html [Broken]
    Last edited by a moderator: May 4, 2017
  4. Aug 24, 2010 #3

    Thanks very much for the reply and link. At least now I have some idea of what I'm looking at!

    I'll try working through the points referring to the 'Loaded Unbalanced Bridge' and see what I can come up with. I'll post back with my attempt.

    Thanks again :smile:
    Last edited by a moderator: May 4, 2017
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