UNIVERSITY OF VICTORIA
SOLUTION OF MIDTERM EXAMINATION June 2012
ELEC 250: LINEAR CIRCUITS 1
NAME:
INSTRUCTOR:
STUDENT NO.:
Dr. Fayez Gebali, P.Eng.
DURATION:
80 MINUTES
TO BE ANSWERED ON THE PAPER
CLOSED BOOK EXAMINATION. NO CALCULATORS ALLOWED.
STUDENTS
ELEC 250
Lecture 16
October 03, 2014
What was discussed last =me
Solving Circuits
Nodevoltage method
Meshcurrent method
Announcements
Homework 4 has been posted. It is due Friday
October 10 at 11:59 pm
S
Department of Electrical and Computer Engineering
COURSE OUTLINE
ELEC 250 Linear Circuits I
Term  FALL 2014 (201409)
Instructor
Dr.
Nikitas Dimopoulos
Phone: 7218902
Email: [email protected]
Chapter 8
RLC circuits
Natural and step responses
Parallel RLC circuits
Developing the equations
of motion
dv 1
I = iC + iL + iR = C +
dt L
v
0 v d + R
t
We can differentiate the above equation to obtain a differential
(and not an integrodifferentia
Chapter 11
ThreePhase Circuits
Motivation
For large power loads over long distances threephase circuits are used
Zline
+
ZLOAD

Zline
Three phase circuits use less wires to transfer the
power
Threephase generation
The three phases
Frequency d
Chapter 8
RLC circuits
Natural and step responses
Parallel RLC circuits
Developing the equations
of motion
dv 1
I = iC + iL + iR = C +
dt L
v
0 v d + R
t
We can differentiate the above equation to obtain a differential
(and not an integrodifferentia
Chapter 9
Steady State Analysis
Sinusoidal responses
Phasors
Sinusoidal Source
This may be voltage or current
v = Vm cos ( t + )
i = I m cos ( t + )
Vm is the amplitude
is the phase angle (expressed in radians)
is the angular frequency (expressed in
CHAPTER 10
POWER
Instantaneous Power
Direction of power ow
p = vi
p = vi
Instantaneous Power
v = Vm cos ( t + v )
i = I m cos ( t + i )
Identifying as the current being that at phase 0
v = Vm cos ( t + v i )
i = I m cos t
Instantaneous Power
We can
NAME:_
Student ID: V00_
ELEC 250
LINEAR CIRCUITS I
CRN11178, 11179
MIDTERM EXAMINATION
OCTOBER 17, 2014
PLEASE ANSWER ALL QUESTIONS ON THE EXAMINATION PAPER
PLEASE WRITE CLEARLY AND JUSTIFY YOUR ANSWERS.
PLEASE DO NOT OMIT STEPS.
JUST A FINAL RESULT WILL
NAME:_
Student ID: V00_
ELEC 250
LINEAR CIRCUITS I
CRN11178, 11179
MIDTERM EXAMINATION
OCTOBER 17, 2014
PLEASE ANSWER ALL QUESTIONS ON THE EXAMINATION PAPER
PLEASE WRITE CLEARLY AND JUSTIFY YOUR ANSWERS.
PLEASE DO NOT OMIT STEPS.
JUST A FINAL RESULT WILL
ELEC 250
Lecture 3
September 9, 2014
What was discussed last >me
Quick (visual) Introduc>on to Electrical/
Electronic circuits and systems
Announcements
Thanks to the class rep volunteers
Eric Ashlee
ELEC 250
Lecture 15
October 01, 2014
What was discussed last ;me
Solving Circuits
Nodevoltage method
Announcements
Homework 3 is due Wednesday October 1 at
11:00 am.
Ques;on 4.69 may be implemented wrongly
ELEC 250
Lecture 8
September 17, 2014
What was discussed last >me
Kirchhofs Current and Voltage Laws
Examples
Announcements
Homework 1 has been posted. It is due Tuesday
September 16
Homework 2 has been pos
ELEC 250
Lecture 14
September 30, 2014
What was discussed last =me
Wheatstone Bridge
Wye to Delta and Delta to Wye
Transforma=ons
The deriva=on of the WyetoDelta has been
posted on the web
Announcements
ELEC 250
Lecture 11
September 23, 2014
What was discussed last =me
Chapter 4
Thevenins and Nortons theorems
Superposi=on principle
Announcements
There will be a quiz next Wednesday
September 24 during the Tutor
ELEC 250
Lecture 13
September 26, 2014
What was discussed last >me
Maximum Power Transfer
Voltage/ Curent Division
Announcements
Homework 3 has been posted. It is due
Wednesday October 1 at 11:00 am.
Schedul
ELEC 250
Lectures 9 and 10
September 19, 2014
What was discussed last >me
Chapter 3
Resistors in series and in parallel
Examples
Announcements
I will be away (on an Engineering Accredita>on visit)
Wednesday
ELEC 250
Lecture 7
September 16, 2014
What was discussed last >me
Passive elements (resistors, capacitors, inductors)
Examples of use and modeling
Ohms law
Demo
Kirchhofs Current and Voltage Laws
Examples
A
ELEC 250
Lecture2
September 5, 2014
What was discussed last <me
Introduc<on and course syllabus
Announcements
The oce hour for today only will be held
between 14:30 and 15:30
Thanks to the class rep volunteer
ELEC 250
Lectures 5&6
September 12, 2014
What was discussed last >me
Voltage
Current
Power
Balance of power
Energy
Nota>on and conven>ons
Examples
Announcements
Homework 1 has been posted. It is due
T
ELEC 250
Lecture 4
September 10, 2014
What was discussed last <me
Voltage
Current
Power
Nota<on and conven<on
Announcements
Homework 1 has been posted. It is due
Tuesday September 16
Please use Mastering of
Chapter 6
Energy storing elements
Inductors, capacitors
Inductors and Capacitors
Inductors store magnetic energy
Capacitors store electric energy
Units of Inductance and
Capacitance
The unit of inductance is the Henry (H)
o 1 Henry is defined as th