Max Power Transfer: Source Voltage & Load Explained

Thread starter gfd43tg
Start date Feb 20, 2014
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Maximum Maximum power Power Power transfer

AI Thread Summary

The maximum power transfer theorem states that maximum power is delivered to a load when the load resistance equals the Thévenin resistance of the source circuit. The Thévenin voltage represents the open-circuit voltage at the load terminals, which is crucial for accurate calculations. While the actual source voltage may differ, the Thévenin voltage simplifies analysis by accounting for internal resistances. The load is indeed arbitrary, but optimizing power transfer requires matching the load to the Thévenin resistance. Understanding these concepts is essential for effective circuit design and maximizing power delivery.

Feb 20, 2014

gfd43tg

Gold Member

Hello,

I was wondering, why is it that when calculating the maximum power transfer, the source voltage is the thévenin voltage, and not the actual source?

What we call the load is arbitrary, no?

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Feb 20, 2014

NascentOxygen

Staff Emeritus

Science Advisor

Homework Helper

Some of the signal is "lost" in that Thévenin resistance, the remainder appears across the external load. Sometimes we wish to maximize the power into the load.

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