Resistors in parallel Thevenin circuit

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When calculating Rth, they took the parallel combo of he 40 kilo ohm and 160 kilo ohm resistors, then they added the 8 kilo ohm resistor that's in series with the combo.

Maybe I'm having a brain freeze or something but how are the 40 kilo ohm and 160 kilo ohm resistors in parallel? They don't have the same voltage across them?
 

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  • #2
phinds
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When finding a Th equivalent circuit, voltage sources are treated as a short circuit when figuring Rth
 
  • #3
NascentOxygen
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When calculating Rth, they took the parallel combo of he 40 kilo ohm and 160 kilo ohm resistors, then they added the 8 kilo ohm resistor that's in series with the combo.
The answer arrived at by this method should be the same as you'd calculate using the open-circuit voltage / short-circuit current approach. This means you can always check your own answer. :smile:
 

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