1. A d'Arsonval ammeter circuit is shown in Figurel When the full scale current through the meter is 3 mA, the corresponding voltage across the meter coil is 150 mV. Answer the following questions: (a) Calculate the value of the shunt resistors RA that allows to measure a full-scale current reading of 5 A and 100 mA respectively (b) How much resistance is added to a circuit when the 5 A ammeter in partla is inserted to measure current? (c) Explain a technique to use the same meter as a voltmeter to measure full-scale voltage of 100 V 150 mV 3 mA RA Ammeter Figure 1: d'Arsonval galvanometer

1. A d'Arsonval ammeter circuit is shown in Figurel When the full scale current through the meter is 3 mA, the corresponding voltage across the meter coil is 150 mV. Answer the following questions: (a) Calculate the value of the shunt resistors RA that allows to measure a full-scale current reading of 5 A and 100 mA respectively (b) How much resistance is added to a circuit when the 5 A ammeter in partla is inserted to measure current? (c) Explain a technique to use the same meter as a voltmeter to measure full-scale voltage of 100 V 150 mV 3 mA RA Ammeter Figure 1: d'Arsonval galvanometer

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter3: Electric Circuits

Section: Chapter Questions

Problem 11RQ

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Concept explainers

Power Measurement

According to Blondel's theorem, the total power is measured with one less number of wattmeters than the number of wires present in the system. So, a single-phase and two-wire system will require one wattmeter and a single-phase and the three-wire system will require two wattmeters, and a three-phase and the three-wire system will also require two wattmeters and a three-phase and the four-wire system will require three wattmeter devices. The wattmeter is a device that measures power using one voltage and one current input as shown in the above figure. Multiple current or voltage input pair cables are used by many power analyzers and digital storage oscilloscopes (DSOs) for measuring watts, in effect within a single instrument acting as multiple wattmeters. It is possible to measure three-phase and four-wire power with one correctly specified power analyzer.

Question

1. A d'Arsonval ammeter circuit is shown in Figurel When the full scale current through the meter
is 3 mA, the corresponding voltage across the meter coil is 150 mV. Answer the following questions:
(a) Calculate the value of the shunt resistors RA that allows to measure a full-scale current reading
of 5 A and 100 mA respectively
(b) How much resistance is added to a circuit when the 5 A ammeter in partla is inserted to
measure current?
(c) Explain a technique to use the same meter as a voltmeter to measure full-scale voltage of 100
V
150 mV
3 mA
RA
Ammeter
Figure 1: d'Arsonval galvanometer

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