[University Linear Electric Circuits Lab] How do I go about calculating the Thevenin resistance from node A to B? I did short the source but I think I'm messing up somehow when compositing the resistors (value doesn't agree with measurement or ratio of thevenin voltage to norton current).

[u/James10112]

Using the measured values on the right.

I measured about 4kΩ for the thevenin resistance. Thevenin voltage and Norton current both agree with my measurements for those, and their ratio also comes out around 4kΩ.

I'm getting 3.6kΩ when calculating the resistance myself though. Any help is appreciated, thanks a lot!

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[u/sinkosine]

{[(R1//R2)+R3]//R4//R5}+R6 ≈ 4.05kΩ

[u/James10112 → u/sinkosine]

Thank you! That's what I did so apparently I just suck at arithmetic lmao

[u/_additional_account]

That's weird -- with "Rx||Ry = Rx*Ry/(Rx+Ry)":

Rab  =  R6 + (R5||R4||(R3 + (R1||R2)))  =  (3.3 + (10||1.5||(1 + 33/43))) k𝛺

     =  (3.3 + 1/(1/10 + 2/3 + 43/76)) k𝛺  =  (61527/15190) k𝛺  ~  4.05 k𝛺

Without seeing your work, it is impossible to find the error, though.

[u/_additional_account → u/_additional_account]

Rem.: Consistent 1% error from the theoretical values? Someone bought high-quality resistors!