ECE 2004: Homework 1
Due Date: September 3rd, 2014 at 5 p.m.
Instructions: submit your homework in pdf format using Scholar.
1. Determine the current flowing through a Li-ion battery if the charge flow is given by:
(a) q(t) = (3t +8) C
(b) q(t) = (8t3 + 4
ECE 2004: Homework 2
Due Date: September 10th, 2014 at 5 p.m.
Instructions:
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documentation.
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ECE 2004: Homework 3
Due Date: September 24th, 2014 at 5 p.m.
Instructions:
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ECE 2004: Homework 4
Due Date: October 1st, 2014 at 5 p.m.
Instructions:
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documentation.
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ECE 2004: Homework 5
Due Date: October 8th, 2014 at 5 p.m.
Instructions:
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ECE 2004: Homework 6
Due Date: October 17th, 2014 at 5 p.m.
Instructions:
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ECE 2004: Homework 7
Due Date: October 24th, 2014 at 8 p.m.
Instructions:
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ECE 2004: Homework 8
Due Date: November 3rd, 2014 at 8 p.m.
Instructions:
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ECE 2004: Homework 9
Due Date: November 12th, 2014 at 8 p.m.
Instructions:
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ECE 2004: Homework 10
Due Date: November 21st, 2014 at 8 p.m.
Instructions:
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ECE 2004: Homework 11
Due Date: December 10th, 2014 at 8 p.m.
Instructions:
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ECE 2004
Electric Circuit Analysis
Chapter 1. Basic Concepts
Objectives
To review the concepts of electric charge, electric
current, voltage, power and energy
To define the conventions for current direction and
voltage polarity
To apply the passive sig
ECE 2004
Electric Circuit Analysis
Chapter 1. Basic Concepts (Part II)
Power and Energy
Electric devices can handle only a certain amount of
power safely
Intuitively, more power will produce a larger output,
Eg.,
A 200 HP vs. 55 HP engine for your car
ECE 2004
Electric Circuit Analysis
Chapter 1. Basic Concepts (Part III)
Circuit, Circuit Elements & Circuit Schematics
An electric circuit is simply an interconnection of
elements
Circuit elements are the basic building blocks of a
circuit
Eg., resisto
ECE 2004
Electric Circuit Analysis
ECE 2004 Electric Circuit Analysis
(CRN 82255)
Instructor
Dr. Rolando Burgos
668 Whittemore Hall
rolando@vt.edu
540.231.0034
Office Hours
Tuesdays and Thursdays from 12:30-2:00 p.m.
GTA:
There will be a group of GTA
Chapter 9, Solution 7.
If f() = cos + j sin,
df
-sin j cos j (cos j sin ) j f ( )
d
df
j d
f
Integrating both sides
ln f = j + ln A
f = Aej = cos + j sin
f(0) = A = 1
i.e. f() = ej = cos + j sin
ECE 2004 HW#5 Solutions
P.P.6.4
v
i(t) =
50t , 0 t 2
100, 2 t 6
1
1
idt 3 idt 10 3 idt
C
10
For 0< t <2,
dt = 25t2 x 103
v
1 t
0 50 t
C
v
1 t
100dt v(2) (100t 0.2 0.1)
2
C
For 2< t <6,
= (100t - 0.1)V
At t = 2ms, v = 100 mV
At t = 5ms, v = (500 - 100)mV
ECE2004 HW#3 Solutions:
P.P.4.12
2vx
+
v
i
+
6
x
2
i
x
+
2
10
A
v
x
(
a
2vx)
6
+
(
b
)
1
V
+
v
6ix = 3
i i x
Isc
x
To get RN consider the circuit in Fig. (a). Applying KVL,
But vx = 1,
+
6i x 2 v x 1 0
ix = 0.5
vx
0.5 0.5 1
2
1
R N R Th
1
i
To find IN,
ECE 2004 HW6 Solutions:
P.P.7.1
12
The circuit in Fig. (a) is equivalent to the one shown in Fig. (b).
i 8
o
+ + v
o 1/3
v
F
x
(a
)
6
+
v
c
+
R
e
q
1/3
F
v
(b
)
R eq 8 12 | 6 12
R eq C (12)(1 / 3) 4 s
vc vc (0) e
-t
60 e
-t 4
60e0.25t V
20e0.25t V
vx
Design Project 3: Implementing the Simple Computer on the DE0 Nano Board
Validation Sheet Page 1, Instructions
The validation sheet is provided as an example of how the GTA will test your implementation.
You do not have to go the CEL to have your implemen
Chapter 9, Solution 4.
Design a problem to help other students to better understand sinusoids.
Although there are many ways to work this problem, this is an example based on the same kind
of problem asked in the third edition.
Problem
(a) Express v = 8 co