An auto mechanic needs to determine the emf and internal resistance of an old battery. He performs two measurements: in the first, he applies a voltmeter to the battery's terminals and reads 11.8 V; in the second, he applies an ammeter to the terminals and reads 15.3 A. What are the battery's emf E and internal resistance r? E = V r = Ω

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An auto mechanic needs to determine the emf and internal resistance of an old battery. He performs two measurements: in the
first, he applies a voltmeter to the battery's terminals and reads 11.8 V; in the second, he applies an ammeter to the terminals and
reads 15.3 A.
What are the battery's emf E and internal resistance r?
E =
V
r =
II
Transcribed Image Text:An auto mechanic needs to determine the emf and internal resistance of an old battery. He performs two measurements: in the first, he applies a voltmeter to the battery's terminals and reads 11.8 V; in the second, he applies an ammeter to the terminals and reads 15.3 A. What are the battery's emf E and internal resistance r? E = V r = II
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