(a) A 100 mA DC ammeter has an internal structure shown in Figure Q2(a)below. Given that the PMMC has an internal resistance of 20 2 and gives a100-degree full scale deflection when carrying a current of 10 mA.PMMC100mARsFigure Q2(a)(i) Find out the value of resistance, Rs.(ii) Calculate the deflecting torque produced at full scale deflection if it has aspring constant, k = 11 x 10 Nm/rad.(iii) Explain briefly why the existence of damping torque is important in anyindicating instrument. State TWO methods to produce damping torque.

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A mA DC ammeter has an internal structure shown in Figure Q2(a) below. Given that the PMMC has an internal resistance of 20 2 and gives a 100-degree full scale deflection when carrying a current of 10 mA.

A mA DC ammeter has an internal structure shown in Figure Q2(a) below. Given that the PMMC has an internal resistance of 20 2 and gives a 100-degree full scale deflection when carrying a current of 10 mA.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Question

100%

(a) A 100 mA DC ammeter has an internal structure shown in Figure Q2(a)
below. Given that the PMMC has an internal resistance of 20 2 and gives a
100-degree full scale deflection when carrying a current of 10 mA.
PMMC
100mA
Rs
Figure Q2(a)
(i) Find out the value of resistance, Rs.
(ii) Calculate the deflecting torque produced at full scale deflection if it has a
spring constant, k = 11 x 10 Nm/rad.
(iii) Explain briefly why the existence of damping torque is important in any
indicating instrument. State TWO methods to produce damping torque.

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