i.Draw a circuit diagram of potentiometer method with naming the componentsand derived the ratio of the two potentiometer readings.ii.In a measurement of resistance by potentiometer, the voltage drops acrossresistor under test and across 0.0252 standard resistors were found to be 0.882Vand 1.2 V respectively. Determine the value of under test.iii.Write two advantages and disadvantages in Potentiometer method.

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i. Draw a circuit diagram of potentiometer method with naming the components and derived the ratio of the two potentiometer readings.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter59: Motor Startup And Troubleshooting Basics

Section: Chapter Questions

Problem 12SQ: How is a solid-state diode tested? Explain.

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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

i.
Draw a circuit diagram of potentiometer method with naming the components
and derived the ratio of the two potentiometer readings.
ii.
In a measurement of resistance by potentiometer, the voltage drops across
resistor under test and across 0.0252 standard resistors were found to be 0.882V
and 1.2 V respectively. Determine the value of under test.
iii.
Write two advantages and disadvantages in Potentiometer method.

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