How Do You Calculate EMF in a Circuit with a Resistor?

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Homework Help Overview

The discussion revolves around calculating electromotive force (emf) in a circuit that includes a resistor. Participants are trying to clarify the relationship between emf and voltage as presented in the problem statement.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster expresses confusion regarding the problem's request for emf and its relation to voltage, seeking guidance on how to approach the calculation. Some participants suggest that voltage and emf may be equivalent in certain contexts, particularly when considering a battery without internal resistance.

Discussion Status

There appears to be a mix of interpretations regarding the definitions of emf and voltage. Some participants have offered insights that suggest a potential resolution, but no explicit consensus has been reached on the correct approach to the problem.

Contextual Notes

The original poster notes a discrepancy in the problem statement, specifically regarding the request for emf when the answer box indicates voltage. This raises questions about the assumptions underlying the problem setup.

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Homework Statement


The question itself doesn't make sense to me, it says to find emf but the answer box has V=
?
problem is an attachment.


Homework Equations


I=e/(r+R)
Ir+IR=emf
P=VI


The Attempt at a Solution


If it wants voltage that's simple P=I^2R P=V^2/R V=54.8V if it wants emf I need some pointers ... Thanks for any help
 

Attachments

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Dont worry - - solved V is emf
 
Here emf is the voltage difference
 
If a battery has no internal resistance, its EMF and its voltage are the same thing.
 

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