Finding Voltage at D and Potential Difference Between B & E

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Homework Help Overview

The discussion revolves around finding the voltage at point D and the potential difference between points B and E in a circuit involving multiple voltage sources. The subject area includes circuit analysis and voltage calculations.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants discuss the voltage at point D, with one noting the connection to different voltage sources and questioning the resulting voltage. Others explore the potential difference between points B and E, using voltage differences along a path in the circuit.

Discussion Status

Some participants have provided guidance on analyzing the circuit by "walking" through the loop to determine potential changes. There is an acknowledgment of the initial confusion regarding the voltage at D, but no explicit consensus has been reached on the final interpretation.

Contextual Notes

Participants are considering the polarities of the batteries and the implications of their arrangement in the circuit, which may affect the calculations and interpretations of voltage and potential differences.

zorro
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Homework Statement



What is the voltage at D ? What is the the potential difference between B and E?

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The Attempt at a Solution



The point D is connected to +6V and -3 V . So the effecting voltage at D is 3 V.
But the answer is -3 V.

For calculating the potential difference, I found out currents in all branches using KLR and JR.
Is there any shorter method without finding out the currents?
 

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Pay careful attention to the polarities of the batteries.

If you "walk" the loop from B to C to D to E, what's the change in potential?
 
From B to C, there is Vc - Vb = -3V and Ve-Vc=-6V (is it right?)
adding them Ve-Vb = -9V
so Vb-Ve = 9V

That answers my second question.
What about the first?
 
Abdul Quadeer said:
That answers my second question.
What about the first?

You passed by the answer when you "walked" from B to D! :smile:

"Walk" the loop from A to B to C to D.
 
I got it now.
Thanks!
 

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