Voltmeter Sensitivity: Select one: a. none of the given answers. b. ratio of the range of voltage /total resistance C. ratio of the total resistance/ input voltage d. ratio of the total resistance/range of voltage O O

Voltmeter Sensitivity: Select one: a. none of the given answers. b. ratio of the range of voltage /total resistance C. ratio of the total resistance/ input voltage d. ratio of the total resistance/range of voltage O O

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter7: Luminaires, Ballasts, And Lamps

Section: Chapter Questions

Problem 15R: A good rule-of-thumb to estimate the expected life of a motor, a ballast, or other electrical...

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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

Voltmeter Sensitivity:
Select one:
a. none of the given answers.
b. ratio of the range of voltage /total resistance
C. ratio of the total resistance/ input voltage
d. ratio of the total resistance / range of voltage

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