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CE163 – Foundations of Electronics I

Assignment 2 Brief - Autumn 2024

GOALS: The purpose of this assignment is to assess your knowledge and understanding of topics covered in the

labs in weeks 9 to 11 and in the lectures in weeks 7 to 11.

Key information: Please read carefully

 Assignment weight: this unit of assessment is worth 20% of the module marks.

 Submission: on FASER, before 13:59:59 on 20 December 2024, with evidence of the work done

previously in your CE163 Onedrive folder (see below).

 The assignment has two parts:

o Part A:

Lab logbook 2 (for Lab Script 4) – Worth 40% of the assignment.

o Part B:

Questions set (see pages 3 to 6 below) – Worth 60% of the assignment.

o Bonus:

extra points for students who completed at least

four of the five Moodle Quizzes.

What to submit:

 To FASER:

o The final version of the file XXXXXXX-CE163-Logbook2.docx from your CE163 Onedrive

(where XXXXXXX is your 7-digit, numbers-only registration number)

o The final version of the document XXXXXXX-CE163-ASG2 B-Answers.docx (also from your

CE163 Onedrive).

Answers for Part B must be entered directly into the ‘Answers’ file on

Onedrive. Any images of scanned hand-written answers must be clear, tidy, and easy to read.

 On Onedrive:

IMPORTANT:

Your personal CE163 Onedrive folder must have clear evidence of

work done from week 9 for the lab activities, and from week 10 for Part B.

Simply submitting a

logbook and/or Part B without this evidence will lead to a zero being given for that part of the

assignment. Uploading to Onedrive only on 20 December will also lead to zero.

The evidence

will be, e.g., saved edits (Onedrive puts a time stamp on all file operations), pictures of the lab

experiments, draft calculations, pictures of Part B answers, etc.

The work you submit must be your own and only your own. You must not discuss the

assignment and/or the work therein with anyone (including websites, social media, or

people/companies/services in the internet) except the module supervisor. Noncompliance

with this rule will carry severe consequences, up to possible expulsion from the university.

Copying work from others without fully acknowledging it, having someone else (or

AI) do the work (fully or partially), using ideas and/or information from others

without fully referencing the source, and other infractions, constitute academic

offenses which:

1) undermine the hard work done by most of your classmates, 2)

diminish the value of the degree towards which you are working, and c) are a

declaration that you find yourself not competent enough to do the required work.

Remember this if the thought of breaking academic rules ever crosses your mind.

This assignment brief is copyrighted by the University of Essex. It or portions of it must not be copied

to anyone or anywhere outside the CE163 2023 students without explicit authorisation from CSEE.

To discourage late starts on the assignment: please send any questions to f.sepulveda by 5pm on

18 Dec. 2023.

Questions sent after this time/date may not receive a reply before the 20 Dec. deadline.

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CE163 - Assignment 2 – Autumn 2024

PART A

(worth 40% of Assignment 2)

For Part A you must submit the final version of your digital Lab Logbook 2 (from Onedrive)

covering Lab Script 4, with the required evidence in your CE163 Onedrive folder.

Be sure

to check the logbook guidelines and examples on Moodle:

https://moodle.essex.ac.uk/course/view.php?id=3643§ion=6

Also, use the following list to check that you have what is required in the logbook:

 For each experiment within a lab script, you must have:

o About 1 page of background material (with adequate rephrasing in your own

words), making you sure you add a reference for each source, even if the sources

are CE163 lectures and/or lab scripts.

The ‘background material’ is a ‘brief introduction to the concepts relevant to the

experiment’.

For example, if an experiment is meant to verify KVL, then you will

need to define what KVL is, show how it is defined mathematically, what it means

physically, what kind of results we would expect from the experiment, etc., including

one or two references and illustrations where applicable.

This background material

is needed to show that you understand the main concepts involved in an

experiment, and it will also provide information that will be useful later when you

discuss the results from the experiment.

E.g., do the results make sense?

Are they

what we should expect? If not, what may have caused discrepancies?

o A description of the experimental procedure in your own words.

The description

should be sufficient for someone to reproduce your work without needing to look

at the lab scripts.

o Results: Tables, calculations, pictures, and drawings related to the experiment.

o A discussion of the results in the context of the topics covered in CE163 and what

results were expected.

If there are large deviations from the theory, include your

idea about what may have caused such deviations.

 All pages must have a date and page number (even if dates are repeated in many pages).

 Large vertical gaps (more than 2-3 lines) in the document must be removed, crossed over

(with Xs), or have a comment such as: [this space has been deliberately left empty].

 A list of references for all the sources you used, including lecture notes, lab scripts, the

main book used in CE163, or any other source.

Use the IEEE referencing system:

https://ieee-dataport.org/sites/default/files/analysis/27/IEEE%20Citation%20Guidelines.pdf

See Part B on pages 3 to 6 below.

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PART B

(worth 60% of Assignment 2)

NOTE: the variable Reg in the questions below is the last four digits in your registration

number (i.e., the one with numbers only).

Part B MARKING CRITERIA

Part B of the assignment has 11 questions.

The maximum marks (i.e., the percentage of the full assignment

marks) for each question is not the same and is shown in brackets next to the question number. Marks will

be allocated for each question based on the following criteria:

a) how correct the answers are,

b) how complete the answers are, and

c) the level and clarity of the explanations and discussions, where applicable.

You must show all the work required to reach the calculation results.

If only the final numerical answers

are given for a particular question, zero marks will be given for that question even if the final answer is

correct.

Remember to use an appropriate number of significant figures (n.s.f.) for the final answers. If in doubt, for

this assignment use 3 to 4 s.f.

Question 1

[6%]

Find the value of RL that would give the maximum power transfer to RL in the circuit in Fig. Q1 and calculate

the value of that maximum power.

Assume that R1 = R3 = Reg/5.0 

and

R2 = R4 = Reg/10.0 .

Fig. Q1

Question 2 [3%]

For the circuit in Fig. Q1 (above), find the Norton-equivalent of that circuit as seen from RL.

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Question 3 [5%]

Suppose a capacitor has two parallel conducting plates with diameter diam = 6.0mm which are separated by

a distance of d = 0.5mm.

The dielectric between the plates has a relative permittivity r = Reg/1000 and a

voltage of

Reg/20.0 V is applied across the plates.

Calculate the following:

a)

The capacitance.

b)

The charge on each of the plates.

c)

The energy stored in the capacitor.

d)

The force between the plates.

Question 4 [7%]

a) Examine the circuit in Fig. Q4 and find the full mathematical equations for the transient behaviour of

vC, iC, and vR after switch 1 is closed.

E = 8.0V,

C = 40 nF,

R = Reg  and that the capacitor was

previously uncharged.

The equations must include the correct initial and final values for voltages and

currents, and the time constant already entered in the equation for each of the variables.

b) Plot the curves for vC, iC, and vR, with the correct axes labels and signs.

You can use software for

this, but hand drawings are fine too.

Fig. Q4

Question 5 [7%]

Using the superposition theorem, find the current and the voltage at R2 for the circuit in Fig. Q5.

R1 = Reg/100.

,

R2 = Reg/50.0 ,

R3 = R4 = Reg/30.0 ,

Vs1 = 10.0V,

Vs2 = 5.00 V,

Vs3 = 3.00V

(carefully observe the voltage

polarities shown).

Fig. Q5

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Question 6 [8%]

For the circuit in Fig. Q6, find the loadline as seen from a hypothetical RL to be placed between points A

and B.

Vs = 9.0 V,

R1 = Reg/10.0

,

R2 = Reg/15.0 , and R3 = R4 = R5 = Reg/30.0 .

Fig. Q6

Question 7 [3%]

Using the loadline you found for the circuit in Fig. Q6, find the operating point Q (i.e. the current and

voltage delivered to RL) if RL = Reg/40.0 .

Question 8 [5%]

Again, using the loadline for the circuit in Question 6, find the new Q-point if now RL represents the entire

circuit shown in Fig. Q8, where R6 = Reg/4

NB: notice that the A and B terminals in Fig. Q8 will be

connected to the corresponding terminals in Fig. Q6 (previous page).

Fig. Q8

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Question 9 [3%]

Suppose a 60 nF capacitor (C1) holds a charge

Q1 = Reg/5.0 nC.

An uncharged capacitor (C2) of 80 nF is

then connected in parallel to it.

After a short

transient, what will be:

(a) the final voltage across each of the capacitors, and

(b) the total electrostatic energy stored by the pair?

Question 10 [5%]

Using the practical diode model, find the voltage at points A, B, C, and D, and the current I for the circuit in

Fig. Q10 for R = Reg/10 .

Vs1 = 10V,

Vs2 = 8V.

NB: notice the polarities in the voltage sources.

Fig. Q10

Question 11 [8%]

The circuit in Fig. Q11 has Vs1 = 3V, Vs2 = 4V, Vs3 = 1V,

R1 = Reg , R2 = 2.5 Reg , and R3 = Reg/1.5 

(a) Describe the steps necessary to obtain the current Io using nodal analysis, and then

(b) proceed to calculate Io using this approach.

Fig. Q11

END OF CE163 ASSIGNMENT 2 – Part B

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