5.1 Series Circuits1. The voltmeters of Figure 5-55 have autopolarity. Determine the reading ofeach meter, giving the correct magnitude and sign.I= 3 AOI=2 A(a) R = 100300m VnOF10FIGURE 5-552. The voltmeters of Figure 5-56 have autopolarity. Determine the reading ofeach meter, giving the correct magnitude and sign.300mVI= 6 A(a) R = 360OFF(b) R=150I=4 A7OFF(b) R=40TO

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Answered: 1. The voltmeters of Figure 5-55 have…

1. The voltmeters of Figure 5-55 have autopolarity. Determine the reading of each meter, giving the correct magnitude and sign. I= 3 A OFF 300mV n (a) R = 100 I=6 A (b) R=150

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

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter5: Components, Symbols, And Circuitry Of Air-conditioning Wiring Diagrams

Section: Chapter Questions

Problem 27RQ: Change the following normally open elements from the de-energized position to the energized...

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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

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5.1 Series Circuits
1. The voltmeters of Figure 5-55 have autopolarity. Determine the reading of
each meter, giving the correct magnitude and sign.
I= 3 A
O
I=2 A
(a) R = 100
300m V
n
OF
10
FIGURE 5-55
2. The voltmeters of Figure 5-56 have autopolarity. Determine the reading of
each meter, giving the correct magnitude and sign.
300mV
I= 6 A
(a) R = 360
OFF
(b) R=150
I=4 A
7
OFF
(b) R=40
TO

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