Assignment # 04
Deadline: Tuesday, 10-06-2014
Questions are in exercise of chap 19
Book is uploaded on google drive along with other lectures.
Q 5, Q11, Q15, Q 17, Q 24
Chapter 18
AC Series-Parallel
Circuits
AC Circuits
Rules and laws developed for dc circuits
apply equally well for ac circuits
Analysis of ac circuits requires vector
algebra and use of complex numbers
Voltages and currents in phasor form
Expressed as RMS
Chapter 19
Methods of AC Analysis
Dependent Sources
Voltages and currents of independent sources
Not dependent upon any voltage or current
elsewhere in the circuit
In some circuits
Operation of certain devices replaces device
with an equivalent model
2
De
Chapter 15
AC Fundamentals
Introduction
2
Alternating Current
Voltages of ac sources alternate in polarity
and vary in magnitude
Voltages produce currents that vary in
magnitude and alternate in direction
3
4
Alternating Current
A sinusoidal ac waveform s
Chapter 17
Power in AC Circuits
Active Power
In dc circuits, for example, the only power
relationship you encounter is P VI watts.
This is referred to as real power or active
power and is the power that does useful
work such as light a lamp, power a heate
Chapter 16
R,L, and C Elements
and the Impedance
Concept
Gerolamo Cardano
Italian Scientist
KVL and differntial equations
2
Introduction
To analyze ac circuits in the time domain is
not very practical
It is more practical to:
Express voltages and currents
Chapter 21
Resonance
2
3
4
Series Resonance
Simple series resonant circuit
Has an ac source, an inductor, a capacitor,
and possibly a resistor
ZT = R + jXL jXC = R + j(XL XC)
Resonance occurs when XL = XC
At resonance, ZT = R
5
Series Resonance
Response c
INDUCTIVE
TRANSIENTS
Introduction
Inductor Voltage
Immediately after the switch is closed, the
current is still zero, (since it cannot change
instantaneously).
Example
E=20 V, Determine i, and VL at the instant switch
is closed.
Current Buildup Transients
INDUCTANCE AND
INDUCTORS
Inventions 1
Alexander Fleming, discovered 'penicillin'
In 1922, Fleming was working on a drug to kill the harmful
bacteria.
While working, Fleming's nose leaked, dropping some mucus
onto the dish.
The bacteria started to disappea