Calculating the power transformed in a real battery

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Homework Help Overview

The discussion revolves around calculating the power transformed in a battery, specifically considering the electromotive force (emf), current, and internal resistance of the battery. The participants are exploring the relationship between these variables and the power output.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are examining the equations for power, specifically P = VI and P = I²R, and discussing whether the total power transformed should be the sum of these two expressions. There is an attempt to clarify the reasoning behind the relationship between the power produced by the battery and the power dissipated in the internal resistance.

Discussion Status

The discussion is ongoing, with some participants providing feedback on the clarity of explanations. There is an indication that the reasoning is being refined, but no consensus has been reached regarding the correct interpretation of the power transformations involved.

Contextual Notes

Participants are questioning the assumptions made about the relationship between the power produced by the battery and the power dissipated due to internal resistance. There may be a lack of clarity in the definitions or terms used in the discussion.

Faiq
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Homework Statement


There is a battery producing emf V and the current around the circuit is I. The battery has an internal resistance of R. What is the power transformed by the battery

Homework Equations


P = VI
P= I2R

The Attempt at a Solution


Maybe P=VI+I2R because there is some electrical energy converted in the cell resulting in the power VI And then the same power is used to create power I2R in the internal resistance.
So shouldn't it be the sum of the two powers because it is the total power transformed.
 
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Faiq said:
Maybe P=VI+I2R because there is some electrical energy converted in the cell resulting in the power VI And then the same power is used to create power I2R in the internal resistance.

I think you are on the right lines but your explanation isn't very clear.

What do you mean by "then the same power is used" ?
 
Electrical power produced by cell = Input power to internal resitance
 
OK.
 

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