American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Electrical Circuit 1 (DC)
Magnetic Circuit Problems and Solutions
Course Teacher: Nafiz Ahmed Chisty
AIR GAPS:
,
Note from the above that the air gap requires the biggest share
(by far) of the impressed NI due to the fact that air is
nonmagnetic.
SERIESP
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Electrical Circuits 1 (DC)
1
DC ? AC?
Direct current: the flow of electric charge is only
in one direction
2
Current
FIG. 1 Random motion of electrons in a
copper wire with no external
pressure (voltage) applied.
The free electron is the charge
carrier i
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Series Circuit
1
Introduction
Two types of current are readily available to the consumer today.
One is direct current (dc), in which ideally the flow of charge (current) does
not change in magnitude (or direction) with time.
The other is sinusoidal altern
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Parallel Circuits
PARALLEL ELEMENTS
Two elements, branches, or networks are in parallel if they have two points in common.
TOTAL CONDUCTANCE AND RESISTANCE
Recall that for series resistors, the total resistance is the sum of the
resistor values.
For paral
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
SERIESPARALLEL NETWORKS
seriesparallel networks are networks that contain both series and
parallel circuit configurations.
General Approach
Study the problem in total  make a brief mental sketch of the overall approach you plan to use.
The result may b
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Electrical Circuits 1 (DC)
1
DC ? AC?
Direct current: the flow of electric charge is only
in one direction
2
Current
FIG. 1 Random motion of electrons in a
copper wire with no external
pressure (voltage) applied.
The free electron is the charge
carrier i
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
CAPACITORS
IHTEAZ MUHAIMEEN HOSSAIN
A BRIEF DISCUSSION ABOUT ELECTRIC
FIELD
Basically an electric field is defined by the region where an electric
charge will experience a force.
It exists around any charged body.
The field can by represented by a set of
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
CIRCUIT THEOREMS
Ihteaz Muhaimeen Hossain
SUPERPOSITION THEOREM
If a circuit has two or more independent sources,
the value of the specific variable is determined by
the contribution of each independent source to
the variable and then add them up.
SUPERPO
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
RL TRANSIENTS: DECAY PHASE
FIG. 1 Demonstrating the effect of opening a switch in series with an inductor with a steadystate current.
FIG. 2 Initiating the storage phase for the inductor L by closing the switch.
FIG. 3 Network of Fig.2 the instant the s
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Capacitors
We shall now examine this phenomenon in greater detail by considering the electric field that exists in the
region around any charged body.
This electric field is represented by electric flux lines, which are drawn to indicate the strength of t
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Electrical Circuit 1 (DC)
Inductor
Course Teacher: Nafiz Ahmed Chisty
FARADAYS LAW OF ELECTROMAGNETIC INDUCTION:
If a conductor is moved through a magnetic eld so that it cuts magnetic lines of ux, a voltage will be induced
across the conductor, as shown
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Network Theorems
Included are the superposition, Thvenins, Nortons, maximum power transfer, substitution, Millmans, and reciprocity
theorems.
SUPERPOSITION THEOREM
Find the solution to networks with two or more sources that are not in series or parallel.
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Magnetic Circuits
MAGNETIC FIELDS
FLUX DENSITY
PERMEABILITY
The permeability () of a material, therefore, is a measure of the ease with which magnetic flux lines can be
established in the material. It is similar in many respects to conductivity in electri
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Title :Familiarizing with the basic DC circuit terms & concepts. Introduction to
Laboratory Equipment.
Abstract:
In this experiment the basic equipment like resistors, trainer board, multi meter etc. was
observed and their operation were studied. Also som
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Series Circuit
1
Introduction
Two types of current are readily available to the consumer today.
One is direct current (dc), in which ideally the flow of charge (current) does
not change in magnitude (or direction) with time.
The other is sinusoidal altern
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Method of Analysis
EEE 1201  Lecture 5
1
Introduction
Methods of analysis have been developed that allow us to approach, in a
systematic manner, a network with any number of sources in any
arrangement.
The methods to be discussed in detail in this slides
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Series Circuits
Two types of current are readily available to the consumer today. One is direct current (dc), in which ideally the
flow of charge (current) does not change in magnitude (or direction) with time. The other is sinusoidal
alternating current
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Series Circuits
Two types of current are readily available to the consumer today. One is direct current (dc), in which ideally the
flow of charge (current) does not change in magnitude (or direction) with time. The other is sinusoidal
alternating current
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
SERIESPARALLEL NETWORKS
seriesparallel networks are networks that contain both series and
parallel circuit configurations.
General Approach
Study the problem in total  make a brief mental sketch of the overall approach you plan to use.
The result may b
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Methods of Analysis and
Selected Topics (dc)
INTRODUCTION
Methods of analysis have been developed that allow us to approach,
in a systematic manner, a network with any number of sources in any
arrangement.
The methods to be discussed in detail in this cha
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
SeriesParallel Networks
1
SeriesParallel Networks
Seriesparallel networks are networks that contain both series and
parallel circuit configurations.
Fig. 1 Series parallel network
2
General approach
Study the problem in total  make a brief mental sket
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Methods of Analysis and
Selected Topics (dc)
INTRODUCTION
Methods of analysis have been developed that allow us to approach,
in a systematic manner, a network with any number of sources in any
arrangement.
The methods to be discussed in detail in this cha
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Parallel Circuits
PARALLEL ELEMENTS
Two elements, branches, or networks are in parallel if they have two points in common.
TOTAL CONDUCTANCE AND RESISTANCE
Recall that for series resistors, the total resistance is the sum of the
resistor values.
For paral
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Parallel Circuit
1
Series or Parallel?
Comment on whether R1, R2 and R3 are in series/parallel/seriesparallel
combination. Signify your answer.
2
Parallel elements
Two elements, branches, or networks are in parallel if they have
two points in common.
FIG
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Method of Analysis
EEE 1201  Lecture 5
1
Introduction
Methods of analysis have been developed that allow us to approach, in a
systematic manner, a network with any number of sources in any
arrangement.
The methods to be discussed in detail in this slides
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Assignment [email protected] network
1. Which elements of the network in Fig. 1 is in series or parallel? In other words, which elements of the given
networks have the same current (series) or voltage (parallel)?
Restrict your decision to single el
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Assignment [email protected] network
1. Which elements of the network in Fig. 1 is in series or parallel? In other words, which elements of the given
networks have the same current (series) or voltage (parallel)?
Restrict your decision to single el
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
Parallel Circuit
1
Series or Parallel?
Comment on whether R1, R2 and R3 are in series/parallel/seriesparallel
combination. Signify your answer.
2
Parallel elements
Two elements, branches, or networks are in parallel if they have
two points in common.
FIG
American International University Bangladesh (Campus 2)
Electrical Circuits 1 (DC)
EEE 1201

Fall 2013
SeriesParallel Networks
1
SeriesParallel Networks
Seriesparallel networks are networks that contain both series and
parallel circuit configurations.
Fig. 1 Series parallel network
2
General approach
Study the problem in total  make a brief mental sket