MadSci Network: Physics

Subject: internal resistance of battery using voltmeter

Date: Tue Sep 2 08:07:04 2003
Posted by Sarah
Grade level: undergrad School: University of Oklahoma
City: Norman State/Province: Oklahoma Country: USA
Area of science: Physics
ID: 1062508024.Ph

I have looked through the archives already, but none of the existing questions 
are specifically related to finding internal resistance with a voltmeter. I 
have worked through the following problem, but I'd like to know whether or not 
my answer is reasonable (or correct). My question involves how to calculate the 
internal resistance of a battery given a set of parameters. For example, if a 
voltmeter whose resistance is 1000 ohms measures the voltage of a worn-out 1.5 
V battery as .9 V, how do you calculate the internal resistance of the battery? 
I've tried to work through this problem a number of ways, but I keep getting an 
answer of about 700 ohms, which seems unreasonably high for the internal 
resistance of a battery.

Re: internal resistance of battery using voltmeter

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