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ANNA UNIVERISTY
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EE6201
CIRCUIT THEORY
OBJECTIVES:
To introduce electric circuits and its analysis
To impart knowledge on solving circuits using network theorems
To introduce the phenomenon of resonance in coupled circuits.
To educate on obtaining the transient response of circuits.
To Phasor diagrams and analysis of three phase circuits
UNIT I BASIC CIRCUITS ANALYSIS
Ohm’s Law – Kirchoffs laws – DC and AC Circuits – Resistors in series and parallel circuits
– Meshcurrent and node voltage method of analysis for D.C and A.C. circuits – Phasor
Diagram – Power,Power Factor and Energy
UNIT II NETWORK REDUCTION AND NETWORK THEOREMS FOR DC AND
AC CIRCUITS
Network reduction: voltage and current division, source transformation – star delta
conversion.
Thevenins and Novton & Theorem – Superposition Theorem – Maximum power transfer
theorem –Reciprocity Theorem.
UNIT III RESONANCE AND COUPLED CIRCUITS
Series and paralled resonance – their frequency response – Quality factor and Bandwidth Self andmutual inductance – Coefficient of coupling – Tuned circuits – Single tuned circuits.
UNIT IV TRANSIENT RESPONSE FOR DC CIRCUITS
Transient response of RL, RC and RLC Circuits using Laplace transform for DC input and
A.C. withsinusoidal input – Characterization of two port networks in terms of Z, Y and h
parameters.
UNIT V THREE PHASE CIRCUITS
Three phase balanced / unbalanced voltage sources – analysis of three phase 3-wire and 4wire
circuits with star and delta connected loads, balanced & un balanced – phasor diagram of
voltages and currents – power and power factor measurements in three phase circuits.
TEXT BOOKS:
1. William H. Hayt Jr, Jack E. Kemmerly and Steven M. Durbin, “Engineering Circuits
Analysis”,Tata McGraw Hill publishers, 6th edition, New Delhi, 2003.
2. Joseph A. Edminister, Mahmood Nahri, “Electric circuits”, Schaum’s series, Tata McGrawHill,New Delhi, 2001.
REFERENCES:
1. Paranjothi SR, “Electric Circuits Analysis,” New Age International Ltd., New Delhi, 1996.
2. Sudhakar A and Shyam Mohan SP, “Circuits and Network Analysis and Synthesis”, Tata
McGrawHill, 2007.
3. Chakrabati A, “Circuits Theory (Analysis and synthesis), Dhanpath Rai & Sons, New
Delhi, 1999.
4. Charles K. Alexander, Mathew N.O. Sadiku, “Fundamentals of Electric Circuits”, Second
Edition, McGraw Hill, 2003.
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EE6201
CIRCUIT THEORY
SL. NO.
CONTENTS
UNIT I BASIC CIRCUITS ANALYSIS
1.1.
INTRODUCTION:
1.2.
BASIC ELEMENTS & INTRODUCTORY CONCEPTS:
1.3.
KIRCHOFF'S LAW
1.4.
PROBLEMS AND CALCULATIONS:
1.5.
DC CIRCUITS:
1.6.
AC CIRCUITS:
1.7.
DIFFERENCE BETWEEN AC AND DC:
1.8.
PARALLEL NETWORKS:
1.9.
MESH ANALYSIS:
1.10.
NODAL ANALYSIS:
PAGE NO
6
6
6
7
9
12
12
13
15
17
24
36
QUESTION BANK
UNIT II NETWORK REDUCTION AND NETWORK THEOREMS FOR
DC ANDAC CIRCUITS
2.1.
NETWORK REDUCTION:
2.2.
VOLTAGE AND CURRENT DIVISION:
2.3.
POTENTIAL DIVIDER:
2.4.
VOLTAGE SOURCE TO CURRENT SOURCE
TRANSFORMATION:
2.5.
CURRENT SOURCE TO VOLTAGE SOURCE
TRANSFORMATION:
2.6.
STAR DELTA CONVERSION:
2.7.
THEVENINS THEOREM:
2.8.
NORTON’S THEOREM:
42
42
42
42
47
47
47
51
57
QUESTION BANK
60
UNIT III RESONANCE AND COUPLED CIRCUITS
3.1.
SERIES AND PARALLEL RESONANCE THEIR FREQUENCY RESPONSE
3.2.
QUALITY FACTOR AND BANDWIDTH
3.3.
SELF AND MUTUAL INDUCTANCE
3.4.
COEFFICIENT OF COUPLING
3.5.
TUNED CIRCUITS
66
66
67
70
72
73
QUESTION BANK
76
UNIT IV TRANSIENT RESPONSE FOR DC CIRCUITS
4.1.
INTRODUCTION:
4.2.
TRANSIENT RESPONSE OF RL CIRCUITS:
4.3.
TRANSIENT RESPONSE OF RC CIRCUITS
4.4.
TRANSIENT RESPONSE OF RLC CIRCUITS
4.5.
CHARACTERIZATION OF TWO PORT NETWORKS IN TERMS OF Z,Y AND
4.6.
H PARAMETERS.
93
93
94
99
101
104
109
QUESTION BANK
UNIT – V ANALYSING THREE PHASE CIRCUITS
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EE6201
5.1.
5.2.
CIRCUIT THEORY
INTRODUCTION:
PHASOR DIAGRAM OF THREE PHASE SUPPLY:
QUESTION BANK
MODEL QUESTION PAPERS
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138
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EE6201
CIRCUIT THEORY
UNIT I
BASIC CIRCUITS ANALYSIS
Ohm’s Law – Kirchoffs laws – DC and AC Circuits – Resistors in series and parallel circuits
– Meshcurrent and node voltage method of analysis for D.C and A.C. circuits – Phasor
Diagram – Power,Power Factor and Energy
1.1.INTRODUCTION:
The interconnection of various electric elements in a prescribed manner comprises as
an electric circuit in order to perform a desired function. The electric elements include
controlled and uncontrolled source of energy, resistors, capacitors, inductors, etc. Analysis of
electric circuits refers to computations required to determinethe unknown quantities such as
voltage, current and power associated with one or more elements in the circuit. To contribute
to the solution of engineering problems one must acquire the basic knowledge of electric
circuit analysis and laws. Many other systems, like mechanical, hydraulic, thermal, magnetic
and power system are easy to analyze and model by a circuit. To learn how to analyze the
models of these systems, first one needs to learn the techniques of circuit analysis. We shall
discuss briefly some of the basic circuit elements and the laws that will help us to develop the
background of subject.
1.2. BASIC ELEMENTS & INTRODUCTORY CONCEPTS:
Electrical Network:
A combination of various electric elements (Resistor, Inductor, Capacitor, Voltage
source, Current source) connected in any manner what so ever is called an electrical network.
We may classify circuit elements in two categories, passiveand active elements.
Passive Element:
The element which receives energy (or absorbs energy) and then either converts it into
heat (R) or stored it in an electric (C) or magnetic (L) field is called passive element.
Active Element:
The elements that supply energy to the circuit is called active element.Examples of
active elements include voltage and current sources, generators, and electronic devices that
require power supplies. A transistor is an active circuit element, meaning that it can amplify
power of a signal. On the other hand, transformer is not an active element because it does not
amplify the power level and power remains same both in primary and secondary sides.
Transformer is an example of passive element.
Bilateral Element:
Conduction of current in both directions in an element (example: Resistance;
Inductance; Capacitance) with same magnitude is termed as bilateral element.
Unilateral Element:
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