Understanding Wheatstone Bridge Circuit: How to Solve for Unknown Voltages

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Homework Help Overview

The discussion revolves around understanding the Wheatstone bridge circuit and solving for unknown voltages within it. Participants are exploring the application of Kirchhoff's laws and the relationships between various voltages and currents in the circuit.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply Kirchhoff's laws to establish relationships between currents and voltages but expresses uncertainty about specific voltage equalities. Others suggest that certain assumptions about current flow and voltage relationships may need reconsideration.

Discussion Status

The discussion is ongoing, with participants questioning the original poster's assumptions and providing insights into the application of Kirchhoff's laws. There is a recognition of the need to clarify the conditions under which certain voltage relationships hold true.

Contextual Notes

Participants note issues with accessing attachments related to the problem, which may limit the ability to fully engage with the context of the question.

needhelpperson
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How do i solve this? I wasn't given any examples at all. But I've tried to do this.

Iab + Iad = Ibc + Idc <--------- they have to or else Kirchoff's law violated.

so Vab = Vad but I'm not sure if Vbc = Vdc?
i'll continue assuming Vbc = Vdc

Vab/40 + Vad/20 = Vbc/70 + Vdc/50

Va=0.45714286 Vc

Vbd/60+ Vc/50 = Va/20

Vbd = 0.1714286Vc

i thought that Va + Vc + Vbd = 20

solved for Vc and i got Vbd as 2.105263 V

The answer is 0.94V. Obviously i got something wrong here. Can some one explain to me where I went wrong, and how i can fix this. Thanks
 

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I cannot download the attachment.Fix it pls
 
ColdRifle said:
I cannot download the attachment.Fix it pls

There's not anything he can do, since it's "pending approval"..
 
needhelpperson said:
Iab + Iad = Ibc + Idc <--------- they have to or else Kirchoff's law violetion

Tis is true only if at BD no current passes. moreover Vad=vdc and Vab=Vbc.
the special about that is that Iab=Ibc+Ibd and Iad=Idc+Idb. The one red is positive and the other negative...Since you find the total current that passes through bd you can measure the voltage across it :approve:
 

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