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Homework Help: What exactly are they asking in this question? Optimum power transfer

  1. Mar 6, 2013 #1
    1. The problem statement, all variables and given/known data

    What is the range of values for [RL/RTH] that provide a combination of “almost” optimum power transfer to the load at a reasonably high power-transfer efficiency?

    2. Relevant equations

    3. The attempt at a solution

    What are they asking for in this question? What do they mean by optimum power transfer? We replaced the source network with the thevenin equivalent.

    Attached Files:

    Last edited: Mar 6, 2013
  2. jcsd
  3. Mar 6, 2013 #2
    Also, I don't understand how load power and source power are not the same. They both have same voltage (VL and IL).

    Attached is the equation for efficiency.

    Attached Files:

    • eqn.png
      File size:
      1.8 KB
  4. Mar 6, 2013 #3

    rude man

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    Homework Helper
    Gold Member

    Load power and source power are the same only if the load resistance equals the source resistance.

    This is a weird question indeed. "Almost"? "Reasonably high ..."?

    The optimum ratio for max. power into the load is when RL/RTH = 1. RTH is fixed.
    What did you get for RTH?
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