Solve Thevenin Resistance: R3 Explained

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SUMMARY

The Thevenin Resistance in the discussed circuit is equal to R3 due to the configuration of R1 and R2. Contrary to the initial assumption that it would be (R1 || R2) + R3, the correct interpretation is that R1 and R2 are in series, and their series combination is effectively shorted, resulting in an equivalent resistance of zero. Therefore, the Thevenin Resistance simplifies to just R3.

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vg19
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Hey,

For the attached question, the only part I do not understand is why the Thevenin Resistance is equal to R3.

I thought it would be (R1 || R2) + R3

Can somebody please explain this?

cheers!
 

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lol i also think wat u think(dont count on that though my ckts suck)...do tell me too why it isnt:d
 
The second hand drawn figure shows it. R1 and R2 are not in parallel. They are in series and their series connection is in parallel with a short circuit, so the equivalent resistance of this connection is zero.
 

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