Circuit Analyses: Find E3 Given Diagram

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Homework Help Overview

The discussion revolves around a circuit analysis problem where the goal is to determine the emf E3 in relation to other quantities in a provided circuit diagram. The context involves understanding the implications of a switch being open or closed in the circuit.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the significance of the switch's state (open or closed) on the circuit's behavior, particularly regarding the voltage across E3. Some suggest using Kirchhoff's Voltage Law (KVL) to analyze the circuit loops and derive relationships between the emfs.

Discussion Status

There is an ongoing exploration of the implications of the switch's position on the circuit analysis. Some participants have offered guidance on using KVL and emphasized the importance of correctly identifying circuit components, though no consensus has been reached on the best approach.

Contextual Notes

Participants note confusion regarding the identification of circuit elements, with a clarification that E1, E2, and E3 are batteries rather than capacitors, which may affect the analysis.

polymerase
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The questions says that it doesn't matter if the switch is open or closed.

It asks, what is the emf E3 in terms of the other quantities shown.

I have attached a diagram of the circuit.

Thank you in advance.
 

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can anyone help me with this question please...
 
It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren
 
chroot said:
It definitely matters whether the switch is open or closed. If the switch is open, one terminal of the capacitor E3 is floating, and it could potentially have any voltage you can imagine across it.

If the switch is closed, just write two KVL equations around each loop, and then use algebra to combine them.

- Warren

they are NOT capacitors they are batteries, E1 and E2, and E3 are all batteries...
 
Okay. I'd advise that you use schematic symbols that are more universal, but that's okay. My advice remains: pick a reference node, write KVL around each loop, and solve for whatever variable you want.

- Warren
 

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