Engineering Find Rth in Thevenin Circuits: Use Resistors to Find Voc

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To find Rth in Thevenin circuits, the selected resistors are crucial as they determine the resistance between nodes A and B after removing current sources. The 1K resistors are used for this purpose, while the 2K resistor does not affect Rth due to its disconnection. To calculate Voc, any method can be applied, but determining the currents through the 1K resistors is key. By multiplying these currents by 1000 and summing the voltages across the resistors, considering polarity, Voc can be accurately found. Understanding the role of each resistor is essential for both Rth and Voc calculations.
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So to find Rth why did they choose these resistors. After choosing those resistors to find Rth , then i must use those resistors and go in a loop to find Voc ?
 

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What do you mean by "those" resistors? Do you mean the 3 1K resistors that go from node A to node B? They chose them because they are the ones that determine the resistance between node A and B once the current sources have been deleted. Since the 2k resistor has one end not connected to anything, it doesn't have any effect on Rth.

To find Voc, you can use any method of solving the network. If you can determine the currents in each of the 1k resistors, then you can multiply each current by 1000 and add up the voltages across each 1k resistor, taking into account the polarity as you follow the path from node A to node B, to get Voc.
 
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