A moving coil instrument of resistance 10 ohms has a 50 division scale and indicates 1 micro ampere per division. (a) How can this instrument be used to measure current up to 25 mA. (b) How can this instrument be used to measure voltage up to 5 volts.

A moving coil instrument of resistance 10 ohms has a 50 division scale and indicates 1 micro ampere per division. (a) How can this instrument be used to measure current up to 25 mA. (b) How can this instrument be used to measure voltage up to 5 volts.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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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

A moving coil instrument of resistance 10 ohms has a 50 division scale
and indicates 1 micro ampere per division.
(a) How can this instrument be used to measure current up to 25 mA.
(b) How can this instrument be used to measure voltage up to 5 volts.

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