A d.c. supply of 120 V is connected to a large resistance X. A voltmeter of resistance 10 k2 placed in series in the circuit reads 4 V. What is the value of X ? What do you think is the purpose in using a voltmeter, instead of an ammeter, to determine the large resistance X?

A d.c. supply of 120 V is connected to a large resistance X. A voltmeter of resistance 10 k2 placed in series in the circuit reads 4 V. What is the value of X ? What do you think is the purpose in using a voltmeter, instead of an ammeter, to determine the large resistance X?

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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Question

A d.c. supply of 120 V is connected to a large
resistance X. A voltmeter of resistance 10 k2 placed in series in the
circuit reads 4 V. What is the value of X ? What do you think is the
purpose in using a voltmeter, instead of an ammeter, to determine the
large resistance X?

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