Finding terminal voltage given two batteries

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SUMMARY

The discussion centers on calculating the terminal voltage of a circuit with two batteries, given a load resistance of 6.6Ω. The key equation used is Terminal V = Emf - ir, where 'i' was determined to be 0.61 A using Kirchhoff's laws. The confusion arose regarding the internal resistance of the batteries, which was clarified by recognizing that both batteries have internal resistances that must be included in the calculations. The solution was achieved by factoring in these internal resistances.

PREREQUISITES
  • Understanding of Kirchhoff's laws
  • Familiarity with terminal voltage calculations
  • Knowledge of internal resistance in batteries
  • Basic circuit analysis skills
NEXT STEPS
  • Study the concept of internal resistance in batteries
  • Learn more about Kirchhoff's voltage and current laws
  • Explore advanced circuit analysis techniques
  • Review practical applications of terminal voltage in real-world circuits
USEFUL FOR

Students studying electrical engineering, circuit designers, and anyone involved in battery performance analysis will benefit from this discussion.

taylorivy
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Homework Statement


http://www.webassign.net/giancoli5/19_31alt.gif
I was given this circuit and told that R=6.6Ω. Based on the information, I was asked to find the terminal voltage.

Homework Equations


Terminal V=Emf-ir
Kirchoff's laws


The Attempt at a Solution


I used Kirchoff's laws to find i=.61 A. From there, I don't understand how to find terminal voltage without knowing internal resistance. I feel like I wasn't taught an equation or something.
 
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taylorivy said:

Homework Statement


http://www.webassign.net/giancoli5/19_31alt.gif
I was given this circuit and told that R=6.6Ω. Based on the information, I was asked to find the terminal voltage.

Homework Equations


Terminal V=Emf-ir
Kirchoff's laws


The Attempt at a Solution


I used Kirchoff's laws to find i=.61 A. From there, I don't understand how to find terminal voltage without knowing internal resistance. I feel like I wasn't taught an equation or something.

It looks like your circuit shows two batteries each with an internal resistance. So what "terminal voltage" is being referred to?
 
Man, I realized that as soon as I looked at the diagram again. I factored in the two given resistances as the internal ones and it worked out perfectly. Thanks anyway!
 

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