You want to determine the emf & and internal resistance r of a battery you found, as well as the resistance R of a resistor, so you connect a voltmeter and an ammeter (both assumed to be ideal) as shown in the figure on the right. a) What is the resistance of an ideal voltmeter? b) What is the resistance of an ideal ammeter? When the switch is open, the voltmeter shows a reading of V₁ = 12 V and the ammeter shows a reading of I₁ = 0 A. You close the switch and the readings change to V₂ = 9 V and I2 = 3 A. c) What is the circuit resistance R? d) What are the emf & and internal resistance r of the battery? S ww R E

You want to determine the emf & and internal resistance r of a battery you found, as well as the resistance R of a resistor, so you connect a voltmeter and an ammeter (both assumed to be ideal) as shown in the figure on the right. a) What is the resistance of an ideal voltmeter? b) What is the resistance of an ideal ammeter? When the switch is open, the voltmeter shows a reading of V₁ = 12 V and the ammeter shows a reading of I₁ = 0 A. You close the switch and the readings change to V₂ = 9 V and I2 = 3 A. c) What is the circuit resistance R? d) What are the emf & and internal resistance r of the battery? S ww R E

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter10: Direct-current Circuits

Section: Chapter Questions

Problem 74AP: Consider a circuit that consists of a real battery with an emf and an internal resistance of r...

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