|MadSci Network: Physics|
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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