MAEG 2020: Engineering Mechanics
Homework 2 (Due on 5/10/2016, Wednesday)
IMPORTANT: Solutions to this assignment are to be presented in a neat and professional format.
Write down the equations, drawing, and assumptions that you used in your calculation.
Previously, we learnt
Energy storage element
Capacitor
C
i
+ v 
Inductor
i
L
+
v

di
v=L
dt
Previously, we learnt
Under steadystate dc
conditions
Replace the
capacitor with an
open circuit and the
inductor with a
short circuit
TRANSIENT RESPONSE
i (t
Operational Amplifiers
The operational amplifier (OA) is an
electronic unit that behaves like a
voltagecontrolled voltage source.
An op is an active circuit element
designed to perform mathematical
operation of addition, subtraction,
multiplication, di
Wye to Delta Transformations
Example 8, Find total resistance between a and b.
Wye to Delta Transformations
Wye to Delta Transformations
Example 9, Find (a) total current supplied by the battery, (b) the current through
each bulb, (c) the resistance of ea
Capacitors and Inductors
Chapter 6
6.1
6.2
6.3
6.4
Capacitors
Series and Parallel Capacitors
Inductors
Series and Parallel Inductors
1
6.1 Capacitors (1)
A capacitor is a passive element designed
to store energy in its electric field.
A capacitor consis
Linearity of Circuit
Node 2 = 2 + 3
Node 1 2 = 1 + 0
= 1 + 3 + 0
41 = (3 + 5)0
0 = 5
1 = 20
73 = 2 + 4(3 + 5) (0+ 1)
I0 is linearly related to Is
3 = 20
Linear circuit
A linear circuit is one whose output is
linearly related to its input.
A linear netw
ELEG 2202B
Fundamental of Electric Circuits
(Electric Circuits)
(Circuits and Devices I)
Dr. Fan ZENG
Importance of Electric Circuit Theory
Importance of Electric Circuit Theory
Importance of Electric Circuit Theory
~ 0.1nm
Course Objectives & Course Cont
Chapter 1: Basic Concepts
Basic Circuit Elements and Laws
The sign of current
a
a
1A
+1A
b
b
l
Reference direction of the current through an element is arbitrarily
defined.
l
If the actual current direction (direction of +ve charge movement) =
reference
FirstOrder Circuits
Chapter 7
7.1
7.2
7.3
7.4
7.5
The SourceFree RC Circuit
The SourceFree RL Circuit
Unitstep Function
Step Response of an RC Circuit
Step Response of an RL Circuit
1
7.1 The SourceFree
RC Circuit (1)
A firstorder circuit is charac