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

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SUMMARY

The discussion centers on the concept of optimum power transfer in electrical circuits, specifically addressing the ratio of load resistance (RL) to Thevenin resistance (RTH). The optimum condition for maximum power transfer occurs when RL/RTH equals 1, indicating that load resistance must match source resistance. The conversation also highlights the distinction between load power and source power, which are equal only when load resistance equals source resistance. The question posed reflects confusion over the terms "almost" and "reasonably high" in the context of power transfer efficiency.

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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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