Q3) A) A moving-coil instrument gives a f.s.d. when the current is 200 µA and its resistance is 200 N. Calculate the value of shunt resistance to be connected in parallel with the meter to enable it to be used as an ammeter for measuring currents up to 500 mA.

Q3) A) A moving-coil instrument gives a f.s.d. when the current is 200 µA and its resistance is 200 N. Calculate the value of shunt resistance to be connected in parallel with the meter to enable it to be used as an ammeter for measuring currents up to 500 mA.

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 16RQ: Which of the following is not a requirement for an electric circuit? a. a source b. a path c. a load...

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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

Q3) A) A moving-coil instrument gives a f.s.d. when the current is 200 µA and its
resistance is 200 2. Calculate the value of shunt resistance to be connected in
parallel with the meter to enable it to be used as an ammeter for measuring currents
up to 500 mA.

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