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-   -   How to calculate thevenin's voltage? (http://physicshelpforum.com/electricity-magnetism/15005-how-calculate-thevenins-voltage.html)

 Asgar07 Nov 20th 2018 01:56 AM

How to calculate thevenin's voltage?

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Attachment 2346

How do i calculate the potential difference between Va and Vb?

 oz93666 Nov 20th 2018 02:14 AM

First just consider the right side of the circuit ... what is the voltage across the 6 Ohm resistor (from the 18V battery) ...

Once you have that voltage you can add or subtract (depending on polarity) from the 72 V to get the answer you require.

 Asgar07 Nov 20th 2018 03:54 AM

i understand that Va = 72 V. But Vb is supposed to be -12 V and the potential difference across Va and Vb is supposed to be 84 V. I want to know how Vb is -12 V

 oz93666 Nov 20th 2018 02:40 PM

The two batteries are connected in such a way that the +ve side of one connects to the -ve side of the other this means the voltages add .

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