In a flat-film strain gage having a rectangular cross section, if the thickness of the film is reduced by 20%, while all other parameters arekept constant, what is the ratio of the new resistance to the old resistance value? Which type of power supply is required to power up a LVDT?does not matterACno power supply requiredDC

Answered: In a flat-film strain gage having a…

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

In a flat-film strain gage having a rectangular cross section, if the thickness of the film is reduced by 20%, while all other parameters are
kept constant, what is the ratio of the new resistance to the old resistance value?

Which type of power supply is required to power up a LVDT?
does not matter
AC
no power supply required
DC

Expert Solution

Step 1

In the given question, the considered conductor is flat film strain gauge.

The resistance of the conductor is directly proportional to the length and inversely proportional to the cross section area given by the below formula,

$R \propto \frac{l}{A}$

where R is resistance, l is the length of conductor and A is a rectangular cross section area of the conductor.

Cross section area of the given conductor is given by formula = $l e n g t h \times b r e a d t h$

In the question, it is given that, the thickness of the flat film is reduced by 20%.

Therefore, the new cross section area will be = $0.8 \times l e n g t h \times b r e a d t h$

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