Engineering [Circuits] Finding maximum power

AI Thread Summary
The discussion focuses on finding the Thevenin equivalent circuit across a load resistor (RL) and determining the conditions for maximum power transfer. The initial calculations yielded a Thevenin resistance (Rth) of 2.88 ohms, with RL also at 2.88 ohms, resulting in a maximum power of 154.3 mW. After identifying an error, the revised values were Rth of 2.933 ohms, RL of 2.933 ohms, and a maximum power of 150.8 mW. The user expresses uncertainty about the correctness of their answers due to the lack of provided solutions for verification. The discussion emphasizes the need for a voltage source and resistance in the Thévenin equivalent analysis.
ainster31
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Homework Statement



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.

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Homework Equations





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:
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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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