Name:
Student No:
Electric Circuits I
Midterm reexam: Thursday, November 1st, 2012
Q1
ENSC 220
Time: 11:45am1:15pm
In the circuit shown in Figure Q1, calculate the current Io.
(8%)
Figure Q1
Q2
Compute the current Io in the circuit shown in Figure Q2 an
11/11/2015
Find the impedance of the load Z to
result
in the maximum power transfer
(frequency=60hz)
40F
8
vs
12
7.5mH
Z
Isolate the load and transform the circuit from time
domain to phasor domain. Determine the Thevenin
Impedance
40F
vs
8
12
66.18j
7.5
12/2/2015
Q1
G
T
A
B
Black box
i(t)
v(t)
Experiment 1:
6.4 div
Ch A
6.4 div
Note that both waveforms have the same frequency.
Calculate the period:
Hence: f1
1
Ch A
Ch A
= f1Ch B
T1 1 103 6.4 div 103 6.4 ms
1000
156 Hz
6.4
= 1Ch B = 2 156 980 rad / s
1
11/30/2012
Q1
8 k
t=0
4 k
20 V
24 k
15 F
Q1 contd
The circuit is a firstorder. However, as
there are more than one
resistor in the circuit,
we need to find Req .
First, find the Thevenin
equivalent of the circuit
as shown.
Remove the source by short
circu
10/13/2015
C H A P T E R
6
Inductance and Capacitance
Electric Circuits I ENSC 220
The 5 Basic Circuit Elements
There are 5 basic circuit elements:
1. Voltage sources (Dependent and
Independent, ideal or real)
2. Current sources (Dependent and
Independent
11/5/2015
Example 1: Find the current i(t) for the RLC circuit, when
Vs(t)=5 cos (1000t) V.
i(t)
Vs(t)
Convert the circuit from time domain to frequency (phasor)
domain:
I
R
X L = jL
XC =
Vs
I
Vs
R
1
j C
X L = jL
XC =
1
j C
Let us first find the total imp
10/31/2015
C H A P T E R
10
Sinusoidal SteadyState Power Calculations
Electric Circuits I ENSC 220
Power in AC Circuits
In the study of DC circuits, power was defined
as the product of voltage and current.
In AC circuits this will be true only when the
11/14/2015
C H A P T E R
8
Natural and Step responses of RLC Circuits
(based on Chapter 8 of Electrical Circuits by NilssonRiedel)
Complete response of circuits
The complete response of a system is
Transient + Forced response
Forced (steadystate) resp
11/11/2015
C H A P T E R
7
Response of firstorder RL and RC circuits
(based on Chapter 7 of Electrical Circuits by NilssonRiedel)
Expected Outcomes for Chapters 7 and 8
At the end of this part of the course, you should
know the following:
Appreciate the
10/25/2015
C H A P T E R
9
Alternating Current Circuits
Electric Circuits I ENSC 220
Expected Outcomes for Chapters 910
At the end of this part of the course, you should
know the following:
Appreciate the properties of periodic signals
Know the parameter
Electric Circuits I
MSE 250
Deadline: 3:00pm on November 29th, 2013
This assignment carries 3%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Assignment #3
Q1. For the circuit shown in Figu
Electric Circuits I
Assignment #2
MSE 250
Deadline: 2:00pm on November 15th, 2013
This assignment carries 3%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Q1 Find the resultant of each of
Electric Circuits I
Assignment #1
MSE 250
Deadline: 2:00pm on October 7th, 2013
This assignment carries 3%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Q1
In the circuit shown in Figure Q
1. Mark the assignment based on this marking scheme
2. Add up the total mark
3. Fill form 2 and enter the total mark with red pen
4. Submit your marked assignment on or before 2:00pm  Friday
October 11th, 2013 by dropping it in the MSE 250 drop box locat
Q1
8 k
t=0
4 k
20 V
24 k
15 F
Q1 contd
The circuit is a firstorder. However, as
there are more than one
resistor in the circuit,
we need to find Req .
First, find the Thevenin
equivalent of the circuit
as shown.
Remove the source by short
circuiting the v
Current and Charge
RC Circuit (Natural Response)
t
dq
i =
dt
q(t ) =
i dt + q ( t 0 )
v(t ) = V 0e
t t0

; t > t0
= RC
t0
RC Circuit (Step Response)
Power and Energy
t
dw
p =
dt
w(t ) =
p dt + w ( t 0 )
v(t ) = V f + (V 0 V f
t0
R eq = R 1 + R 2 +
Channel A
e(t)
Black box
i(t)
0.5
Q1(i)
Channel A
Note that both waveforms have the same frequency.
Calculate the period: T = 200 106 5 div 103 m sec/ sec = 1m sec
Hence:
1
fCh A = f ch B =
= 1000 Hz
3
110
Ch A = ch B = 2 f = 2 1000 Hz = 6280 rad / sec
Q1
Q1
Vs
Is
Q1 session 1
a
Is
b
KCL at node a, note that Va=8 V
8 Vs 8 8 6
+ +
= 2 Vs = 17 V
3
2
2
Q1 session 1
a
Is
b
KCL at node b:
17 8
8 6
+ I s = + I s = 3A
3
2 3
Q1session 1
Q1 session 2
Vs
Is
Q1 session 2
a
b
KCL at node a, note that Va=7 V
7 Vs 7 7
Q1
Determine the current I12 in the circuit shown in Figure 1.
Figure 1
Q2
Figure 2 shows a resistive circuit. When V1=120 V, the ammeter, the voltmeter, and the
wattmeter read 0.04 A, 40 V, and 1.6 W respectively. Determine the readings of these
instrume
11/30/2012
Figure Q3a shows the waveforms obtained while analyzing the
circuit shown in Figure Q3b. The black box contains two elements in
series. Assuming zero current in the circuit at t = 0. The time base,
channel A, and channel B are set at 5.00ms/d
Name:
Student No:
Electric Circuits I
Midterm Exam: Thursday, 18th October 2012
Q1
ENSC 220
Time: 11:45am
1:15pm
In the circuit of Figure Q1, the voltmeter reads 8 V. Determine Vs and Is.
(8%)
Figure Q1
Q2
In the circuit shown in Figure Q2, calculate the
Name:
Student No:
Electric Circuits I
Midterm Exam: Thursday, 18th October 2012
Q1
ENSC 220
Time: 11:45am
1:15pm
In the circuit of Figure Q1, the voltmeter reads 7 V. Determine Vs and Is.
(8%)
Figure Q1
Q2
In the circuit shown in Figure Q2, calculate the
Electric Circuits I
Assignment #1
MSE 250
Deadline: 2:00pm on October 15th, 2015
This assignment carries 4%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Q1
In the circuit shown in Figure
Electric Circuits I
Assignment #1
ENSC 220
Deadline: 3:00pm on October 4th, 2012
This assignment carries 2%
Drop your solution in the ENSC 220 dropbox located in front of MSE office at the
fourth floor of Surrey Central.
Q1
In the circuit shown in Figure
Electrical Circuits I (MSE 250)
Fall 2015
Please strictly follow the instructions in this document. Failure to do so may lead to losing
part or entire mark associated with this assignment. Assignment 1 carries 6% of the total
assessment of the course. The
Q1
Load resistor (R) in Figure Q1 absorbs 0.6 W. What is the value of the load resistance?
Figure Q1
Q2 The maximum power delivered to the 500 resistor in Figure Q2 is 80.4 W. (i) Determine the
reading of the voltmeter. (ii) Find the percentage of the tot
Electric Circuits I
ENSC 220
Deadline: 3:00pm on November 15th, 2012
This assignment carries 4%
Drop your solution in the ENSC 220 dropbox located in front of MSE office at the
fourth floor of Surrey Central.
Assignment #2
Q1.
Figure Q1b shows the wavef
Electric Circuits I
Assignment #2
MSE 250
Deadline: 11:00am, November 13th, 2015
This assignment carries 4%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Q1 Find the resultant of each of t
Welcome to Electric Circuits I
Why should I study this subject?
What is this course all about?
What would I learn?
Who is teaching the subject?
How the course is structured?
How to prepare and study for this course?
How am I assessed in this course
Electric Circuits I
ENSC 220
Deadline: 11:00am on November 30th, 2012
This assignment carries 4%
Drop your solution in the ENSC 220 dropbox located in front of MSE office at the
fourth floor of Surrey Central.
Assignment #3
Q1. For the circuit shown in F
Electric Circuits I
MSE 250
Assignment #3
Deadline: 1:00pm on November 30, 2015
This assignment carries 4%
Drop your solution in the MSE 250 dropbox located in front of MSE office at the fourth
floor of Surrey Central.
Q1. For the circuit shown in Figure
Q1: In the circuit shown in Figure Q1, calculate
the power supplied by the 12 V
source.
V3
V2
V1
Due to presence of floating source, we use
Supernode method. Select node d as the
reference and assign nodal voltage to nonreference node V3.
d
I1
Note that V
Q1
The black box in the circuit shown in Figure 1a contains a number of seriesconnected
elements. The circuit was connected to an oscilloscope as shown. Two experiments were
conducted such that all parameters were fixed except the source frequency which