A voltmeter connected at points a and b measures the voftage between the two terminals of a used battery of unknown internal resistance and emf. An extemal resistor R= 800 2 completes the circuit when the switch is closed. When the switch is open the voltmeter reads 11 V. Once the switch closes the voltage reading becomes 7 V. V R Determine the internal resistance r, in Ohms, of the battery.

A voltmeter connected at points a and b measures the voftage between the two terminals of a used battery of unknown internal resistance and emf. An extemal resistor R= 800 2 completes the circuit when the switch is closed. When the switch is open the voltmeter reads 11 V. Once the switch closes the voltage reading becomes 7 V. V R Determine the internal resistance r, in Ohms, of the battery.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter29: Direct Current (dc) Circuits

Section: Chapter Questions

Problem 19PQ

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