Engineering and Construction Electrical Principles
EAT113 Electrical Principles
–
In Flight Referral Coursework
PART I
A particular type of battery can be modelled as an ideal voltage source and a series internal resistance
R
int
. Design an experiment to accurately measure the value of the series internal
resistance for a given
battery. You have the following equipment available:
?
Voltmeters
?
A variable resistor
?
A resistor of known resistance R
k
Your experimental design should contain the following elements:
?
A circuit diagram showing the experimental setup
?
An
explanation of your experimental method
?
An explanation of the analysis/calculations you will perform to estimate R
int
including an
explanation of how you will minimise the effects of experimental error.
PART II
You are required to design an experiment w
hich can be used to measure the relative permeability of a
sample of material. You have the following materials available
?
A soft iron toroid with an air
–
gap the precise size of the samples to be evaluated.
?
An unlimited quantity of insulated wire.
?
A multim
eter capable of measuring AC RMS voltages
?
A signal generator capable of producing a sinusoidal voltage wave form.
Write a description of an experiment which can be used for this purpose. Your description should
include:
?
An explanation of the underlying pr
inciple for the experiment
?
A diagram showing the experimental setup.
?
An outline of the calculations which will be used to process the results
PART III
You are given a ‘black box’ digital circuit with four inputs and a single output
. The output is an unknow
n
combinatorial logic function of the four inputs
. Describe an experimental process which could be used to
design a circuit to replicate the ‘black box’ circuit.
You should present your work as a written technical report following the normal style convent
ions for
such a document. The marks will be allocated as per the attached mark
–
sheet.
Mark Sheet
Part I
2
4
6
8
10
Circuit Diagram of Experimental Setup
Explanation of Experimental Method
Explanation of Data Analysis
Explanation of
how Experimental Error will be Minimised
Part II
Experimental Principle
Diagram
Outline of Calculations
Part III
Experimental Procedure
Design Procedure
Presentation and Format of Report:
Total Mark:
/100
Submission Deadline: 17pm, Friday 23
rd
May.
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