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Homework Help: [Circuits] Finding maximum power

  1. Feb 27, 2014 #1
    1. The problem statement, all variables and given/known data

    a. Find the Thevenin equivalent circuit across RL.
    b. What is the value of RL for maximum power?
    c. Calculate the maximum power that can be transferred to the resistor RL.


    2. Relevant equations

    3. The attempt at a solution

    [strike]a. Rth=2.88 ohm
    b. RL=2.88 ohm
    c. P=154.3 mW[/strike]

    Edit: looks like I found an error. Here is my second attempt:

    a. Rth=2.933 ohm
    b. RL=2.933 ohm
    c. P=150.8 mW

    I have a test upcoming and we were given this as a practice question. Unfortuantely, there is no answer so I don't know if I it is correct or not. Can anyone let me know if my answers are right? I used MultiSim to check the answers for my other practice questions and I found mistakes. I can't use MultiSim to check this one.

    This is the other similar problem that I need to make sure I have done correctly: http://i.imgur.com/g2JaZXO.png

    My answer: P=69.4 mW
    Last edited: Feb 27, 2014
  2. jcsd
  3. Feb 27, 2014 #2


    User Avatar

    Staff: Mentor

    Had you provided your working, someone may have looked over it to see whether the approach was right.

    A Thévenin equivalent requires a voltage source and a resistance.
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