The discussion centers on solving a homework problem involving the Thevenin equivalent circuit, specifically identifying points A and B across a 10k resistor. Participants confirm that nodal analysis is correctly applied to nodes V_A and V_AB, but raise concerns about the removal of the 10k resistor and the calculation of V_{Th}. It is established that V_{Th} should be calculated as V_{AB} - V_A, rather than equating V_{AB} directly to V_{Th}. The importance of retaining the load resistor in the analysis is also emphasized.
PREREQUISITESElectrical engineering students, circuit designers, and anyone involved in analyzing or teaching Thevenin equivalent circuits.
if you look at the second circuit i have labeled the two nodes V_A and V_AB, those are the two nodes in which i am going to do nodal analysis in.doodle said:Before you can actually start solving the problem, you will need to identify firstly the two points A and B for which the Thevenin equivalent circuit is defined. So where are these points upon which you want to find the Thevenin equivalent circuit? Across the 10k resistor?
GREAT! thanks teknodude!teknodude said:I didn't calculate the Vth, but your work nodal analysis looks correct to me. On a side note, you didn't really need to convert the mA to A or the kohms to ohms. The prefixes will cancel giving you V during the calculations. Now find Rth to complete the problem.
mugzieee said:if you look at the second circuit i have labeled the two nodes V_A and V_AB, those are the two nodes in which i am going to do nodal analysis in.
doodle said:I have a few concerns.
1. Why remove the 10k resistor? Shouldn't the load resistor (if there should be one) be lying between the two points where the Thevenin equivalent circuit is defined?
2. I don't think V_{AB} = V_{Th} as you have written in the solution. If the Thevenin equivalent circuit is to be determined across nodes AB and A, then V_{Th} = V_{AB} - V_A.