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

AI Thread Summary
The discussion centers on understanding a homework question regarding optimum power transfer and efficiency in electrical circuits. It clarifies that optimum power transfer occurs when the load resistance (RL) equals the Thevenin resistance (RTH), resulting in a ratio of RL/RTH equal to 1. The conversation highlights confusion around the terms "almost" and "reasonably high" in the question, suggesting ambiguity in the requirements. It also notes that load power and source power are equal only when the load resistance matches the source resistance. The participants seek clarity on the specific values of RTH to better address the problem.
InvalidID
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Homework Statement



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?

Homework Equations


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.
 

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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.
 

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InvalidID said:
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.

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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