Answered: A uniform potentiometer wire, AB, is 4…

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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Question

a) A moving-coil galvanometer, of resistance 5 Ω,
gives a full-scale reading when a current of 15 mA
passes through the instrument. Explain, with the
aid of circuit diagrams, how its range could be
altered so as to read up to: (i) 5 A; (ii) 150 V.
Calculate the values of the resistors required.
(b) A uniform potentiometer wire, AB, is 4 m
long and has resistance 8 Ω. End A is connected to
the negative terminal of a 2 V cell of negligible
internal resistance, and end B is connected to the
positive terminal. An ammeter of resistance 5 Ω
has its negative terminal connected to A and its
positive terminal to a point on the wire 3 m from
A. What current will the ammeter indicate?

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