THE UNIVERSITY OF MELBOURNE
Semester 1 Assessment
June 2020
Department of Electrical and Electronic Engineering
ELEN20005 FOUNDATIONS OF ELECTRICAL NETWORKS
Writing Time: 180 minutes
Reading time: 15 minutes
Scan and upload time: 30 minutes
This examination paper has 8 pages.
Instruction to students:
Attempt ALL questions. Write your test answers using pens and A4 paper. Tablets
and other electronic software may not be used for writing your test answers. Start each
question on a new sheet of paper. Only write on one side of each sheet of paper.
The questions carry weight in proportion to the marks in brackets after the question num-
bers. These marks total 100 marks. You must show your work in order to receive credit!
The format of the test is open book, meaning that students may have unlimited access to
printed or online materials.
Students may use any computational software for numerical calculations, however the marking
scheme will require that students show the details of their calculations as if a CASIO FX-82
or CASIO FX-100 calculator had been used.
Your work must be scanned and uploaded to CANVAS as a single pdf file. This must be done
by 6.45 p.m. Late submissions will not be marked
ELEN20005 Foundations of Electrical Networks Semester 1 Exam 2020
Question 1 (10 marks)
(a) [7 marks] In the following circuit, use Node Voltage Analysis to find the node voltages
v1 and v2. Hence find the current ix.
2A
SQ IOQ
2A 20Q IA
–
(b) [3 marks] Is the 1 A current source generating or consuming power Justify your answer.
Question 2 (12 marks)
Consider the following circuit, with output terminals a and b.
(a) [8 marks] Find the The′venin equivalent circuit.
(b) [4 marks] Now assume a 20 load resistor is attached across the output terminals of the
circuit. Find the power of the 2 A current source. It is generating or consuming power
Page 2 of 8
ELEN20005 Foundations of Electrical Networks Semester 1 Exam 2020
Question 3 (16 marks)
In the circuit below, a sinusoidal voltage source VS(t) = Vm cos(ωt) V is applied to a load
consisting of an inductance L, resistance R and capacitance C, connected in series. VR(t) is
the resistor voltage.
PSfrag replacements VS
i L
C
R
+
