### Subject: internal resistance of battery using voltmeter

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

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Re: internal resistance of battery using voltmeter

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