How can i put the polaritiy of E thevenin's ?

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Discussion Overview

The discussion revolves around understanding the polarity of the Thevenin equivalent voltage (E Thevenin) in circuit analysis, particularly focusing on the implications of battery orientation and terminal assignments in potential dividers.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant expresses confusion about the established polarity of the Thevenin voltage and questions why it is set in a specific way.
  • Another participant suggests that the polarity is determined by analyzing potential dividers, indicating that one terminal (Vb) is more positive than the other (Va).
  • A participant proposes that the battery symbol can be flipped if the voltage is specified as negative, although this might conflict with conventional expectations regarding battery terminal designations.
  • There is a suggestion that changing the positions of terminals "a" and "b" would allow for a different orientation of the battery symbol, provided the ground reference is also adjusted accordingly.

Areas of Agreement / Disagreement

Participants appear to agree on the possibility of changing the battery orientation under certain conditions, but there is no consensus on the implications or preferences regarding conventional battery polarity representation.

Contextual Notes

The discussion does not resolve the implications of changing battery polarity or the potential confusion it may cause among practitioners who adhere to conventional representations.

bibo_dvd
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Hello guys ..

i need your help with something

in this photo i understand the way to calculate R thevenin's and the way to calculate E thevenin's

but i couldn't understand

why did we put the polarity in this way ??

i mean why can't we put switch the polarity of the battery ??

Nbgt3Hl.jpg


thanks guys :))
 
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bibo_dvd said:
why did we put the polarity in this way ??
Because solving the potential dividers shows that Vb is greater (more positive) than Va.

i mean why can't we put switch the polarity of the battery ??
If you want to turn the battery symbol around you can do so by specifying the battery voltage to be -6V rather than +6V. Technically this is allowed, but it may bother some who insist that a battery's positive terminal really should be positive with respect to its negative terminal :smile:
 
okay that's mean that we can turn the symbol of the battery if we turned "a" and "b" in the other side ??
i mean if we put b in the upper right side and a in the lower right side ?? :)
 
bibo_dvd said:
okay that's mean that we can turn the symbol of the battery if we turned "a" and "b" in the other side ??
i mean if we put b in the upper right side and a in the lower right side ?? :)

Sure, if you also move the ground symbol to the top so it stays connected to b.
 

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