Find R: Internal Resistance Equation

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SUMMARY

The internal resistance equation is defined as r = (E - V) / R, where E represents the electromotive force (emf), V is the terminal voltage reading, and R is the resistance of the voltmeter. To find the internal resistance r of a battery, one must rearrange the equation to isolate r, using known values for E and V. The resistance R of the voltmeter must be known or measured to accurately compute the internal resistance.

PREREQUISITES
  • Understanding of basic electrical concepts, including voltage, current, and resistance.
  • Familiarity with algebraic manipulation of equations.
  • Knowledge of electromotive force (emf) and its significance in electrical circuits.
  • Ability to measure resistance using a multimeter or similar tool.
NEXT STEPS
  • Learn how to measure the resistance of a voltmeter using a multimeter.
  • Study the principles of electromotive force (emf) in electrical circuits.
  • Explore algebraic techniques for rearranging equations in physics.
  • Investigate the impact of internal resistance on battery performance and efficiency.
USEFUL FOR

Students in electrical engineering, physicists, and anyone involved in battery technology or circuit analysis will benefit from this discussion.

heelp
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In this equation I r= E-V/V*R


How would I find R? thanks in advance you your help.
 
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What do you mean? Are you asking about how to do the algebraic manipulations? And where are the parens in your equation?
 
Oops. r= (E-V/v)*R

This equation shows that knowing the emf E, the voltmeter's reading of the terminal voltatge V, and the resistance of the voltmeter R, the unknown internal resistance r of the battery can be computed.


I'm trying to find r. I know E,AND V. But I don't know how to find R.
 

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