Assessment Details and Submission Guidelines
Course Name Bachelor of Engineering (Telecommunication)
Unit Code BE104
Unit Title Electrical Circuit Fundamentals
Assessment Author Dr. Hoang Nguyen
Assessment Type Written, Individual Work
Assessment Title Assignment 1 (Individual Work)
Unit Learning Outcomes covered in this assessment b) Apply electrical circuit laws to calculate currents, voltages and powers in linear and nonlinear AC and DC electrical circuits using a variety of analytical methods.
d) Simplify complicated electrical circuits into their equivalent Thevenin and Norton circuits.
g) Understand basic electrical quantities and their units, as well as the relationships between them.
Weight 10% of the total assessments
- Part A: 4%
- Part B: 6%
Total Marks 100
- Part A: 40
- Part B: 60
Word/page limit Maximum 2000 words (8 A4 pages)
Release Date Week 1
Due Date Part A: Week 3, Tuesday, 7/4/2020, 23:55 Part B: Week 7, Tuesday, 5/5/2020, 23:55
Submission Guidelines • All work must be submitted on Moodle by the due date along with a completed Assignment Cover Page.
• Download the assignment cover page on Moodle, complete it and make it the cover page of your submission.
• The assignment must be in MS Word format, 1.5 spacing, 11-pt Calibri (Body) font and 2 cm margins on all four sides of your page with appropriate section headings.
• Reference sources must be cited in the text of the report, and listed appropriately at the end in a reference list using the IEEE referencing style.
• Students must ensure before submission of final version of the assignment that the similarity percentage as computed by Turnitin has to be less than 10%. Assignments with more than 10% similarity may not be considered for marking.
Extension • If an extension of time to submit work is required, a Special Consideration Application must be submitted directly to the School's Administration Officer, in Melbourne on Level 6 or in Sydney on Level 7. You must submit this application three working days prior to the due date of the assignment. Further information is available at:
• Academic Misconduct is a serious offence. Depending on the seriousness of the case, penalties can vary from a written warning or zero marks to exclusion from the course or rescinding the degree. Students should make themselves familiar with the full policy and procedure available at: http://www.mit.edu.au/about-mit/institute-
publications/policies-procedures-and-guidelines/Plagiarism-Academic-MisconductPolicy-Procedure. For further information, please refer to the Academic Integrity Section in your Unit Description.
This assessment contains two parts: part (A) and part (B). Part (A) is due in week 3 and part (B) is due in week 7.
HD 80%+ D 70%-79% C
50%-59% N 50%
Question 9 All answers are present with excellent solution. Logic is clear and easy to follow with strong Answers present with very good solution. Consistency logical and convincing. Answers present with good solution. Mostly consistent and convincing. Mostly good, Most answers present. Adequate correct and conviction. Acceptable presentation. Lacks answers or unclear to question. Poor structure and careless presentation.
The marking point are mapped with the questions. Regarding each question, full marks are awarded for the correct solution, description or explanation and the answer responds clearly the question asked. The use of supporting evidence, illustration and calculation is correctly relevant to the answers. The answers show all the steps solved for the question.
Questions Description Marks
Question 1 The marking point are mapped with the questions. Regarding each question, students get full marks for the correct solution, description or explanation and the answer responds clearly the question asked. The use of supporting evidence, illustration and calculation is properly relevant to the answers. The answers show all the steps solved for the question. 10
Question 2 10
Question 3 10
Question 4 10
Total part A 40
Comments updates of PART A Give proper updates based on the feedback given from Part A. 10
Question 5 The marking point are mapped with the questions. Regarding each question, students get full marks for the correct solution, description or explanation and the answer responds clearly the question asked. The use of supporting evidence, illustration and calculation is properly relevant to the answers. The answers show all the steps solved for the question. 10
Question 6 10
Question 7 10
Question 8 10
Question 9 10
Total Part B 60
Total Part A and Part B 100
arguments, explanation and calculation. Proper writing. Professionally presented. Properly written, with some minor deficiencies. but some unclear or presentation problems.
Part A [40 marks]
Question 1 [2+2+2+4 marks = 10 marks]
(a) - Describe what an electric circuit is?
- Research and draw a simple block diagram to explain how you can charge your mobile phone from the main power supply.
(b) - What is the electric current?
- Describe the difference between direct current (DC) and alternating current (AC)
- Plot the DC and AC current respect to the time change. Also, state the units used to measure each of them.
(c) What unit is used to describe an electrical charge?
(d) Assume that the total charge entering an electric circuit is ??(??) = 10????????(20????) ????.
• Determine the current i(t) through this circuit.
• Using Matlab program to plot this current function for the interval 0 = t = 1 s.
• Compute the charge q(t) and the current i(t) at time t=1/10 s. Compare the result with the plot in Matlab.
Question 2 [5x2 marks = 10 marks]
Assume that an independence current source I passes through two resistors R1 and R2 in an electric circuit:
(a) Construct and label the electric circuit (Make sure you use the right symbol)
(b) State the mathematical formula to calculate the voltage V that has fallen across each resistor. Find the voltage if R1=30 ?, R2=20 ? and I=2 mA.
(c) Change the Voltage in Part (b) in three different Units but equal value.
(d) State the mathematical formula for the power P dissipated in each resistor by the current. Find the power for the values obtained in Part (b).
(e) In Part (b) find the voltage across each resistor if you short the resistor R1 and open the circuit between R1 and R2. (Hint: draw the short and open circuit first before calculating the voltage)
Question 3 [5+5 marks = 10 marks]
The electrical charge flowing through an electrical element is plotted in Figure 1.
(a) Find the current at t= 1s, 4s and 7s.
(b) Sketch the corresponding current vs time from 0-8 s through the element.
Figure 1: Electrical charge flowing through an electrical element.
Question 4 [2+3+3+2 marks = 10 marks]
For the circuit below in Figure 2:
(a) Use KVL to determine the voltage V0 in the left hand (LH) loop.
(b) Determine the power dissipated by the 5 k? and 20 k? resistors.
(c) Determine the power delivered by the dependent voltage source.
(d) Confirm that the power delivered by the dependent source is the same as the power absorbed by the resistors.
Figure 2: The electrical circuit diagram for Question 4.
Part B (60 marks)
Comments Updates of PART A (10 marks) You need to fix and update of the assignment 1 based on the feedback and comments from your Part A and then continue your assignment with Part B.
Question 5 [10 marks]
Apply the Ohm’s Law, the Kirchhoff Voltage Law (KVL) and the Kirchhoff Current Law (KCL) to find the current i0 and the voltage v0 in the electrical circuit shown in Figure 3.
Figure 3: The electrical circuit diagram for Question 5.
Question 6 [5x2 marks =10 marks]
In the circuit in Figure 4, resistance value R1, R2, R3 and R4 have a value of 2?, 6?, 6? and 5?. The voltage of V1=20V.
(a) Find the equivalent resistance (Req) in the circuit.
(b) Determine the current through each resistance I1 to I4.
(c) Determine the power dissipated by each resistor and the power delivered by the independence voltage source. Confirm that the power delivered by the independent source is the same as the power absorbed by the resistors.
(d) Use LTspice program to create the circuit and compute for all the resistor voltages and currents. (e) Compare your simulation measurements with the results of your calculations.
Figure 4: The electrical circuit diagram for Question 6.
Question 7 [10 marks]
Using the Cramer’s rule and the basic laws for electrical circuit analysis, compute the voltages at the nodes of the electrical circuit shown in Figure 5.
Figure 5: The electrical circuit diagram for Question 7.
Question 8 [5+5 marks = 10 marks]
Apply Thevenin’s theorem on the electrical circuit in Figure 6.
(a) Compute the equivalent Thevenin circuit to the left of the terminals a-b.
(b) Using your results in Part (a), compute the current passing through the resistor RL=8 ?.
Figure 6: The electrical circuit diagram for Question 8.
Question 9 [5+5 marks = 10 marks]
Apply Norton’s theorem on the electrical circuit diagram in Figure 6.
(a) Compute the Norton equivalent circuit to the left of the terminals a-b.
(b) Using your results in Part (a), compute the voltage fallen across the 3? resistor in the circuit.