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-----------------------------------------------------------------------------------Network Thoery
NETWORK THEORY
Objective:
The overall objective of teaching this semester course on Network Theory is to giventhe Under Graduate Engineer a through good knowledge of electrical engineeringthrough Network Theory circuits for second year second semester EEE Students. Thissubject is ontinuous to Electrical ircuits. !t the end of the second year secondsemester the student would develo an in de th knowledge of Three hase circuits #star and delta connection for balanced and unbalanced loads$% Transient o eration of thecircuits for &. and as well as !.. Networks% Network 'unctions% Two ort Network (arameters#)%*%!+& and h- arameters$%'ilter and 'ourier series functions for !..ircuits .E,ui ed with this knowledge the student would be able to analye manyengineering roblems by tracing the various elements in the set rocesses in terms of theelectrical e,uivalents. The subject of Network Theory would constitute a basic building block for electricalengineers % in the understanding of electric ower and its Transient state and steady statecharacteristics. Such understanding would also hel the engineer to design his systemafter analying the circuit under all conditions.
Before commencement of the subject the student should have a knowledge of :
ector calculus
om le/ arithmetic
arious functions like trigonometric and e/ onential etc.
0nowledge about solution of &ifferential e,uations in time domain and 1a lacetransform methods.
&ifferentiation and 2ntegration of different functions.+..3.2.T. ourse 'ile -----------------------------------------------------------------------4
-----------------------------------------------------------------------------------Network Thoery
UNIT – I THREE PHASE CIRCUITS
Objective:
The objective of this unit is to make the students familiar with the basic fundamentals of electrical circuits and introduce him5her in the following to ics6
&ifferent circuit elements#3%1 and $ and their characteristics.
Source Transformation of Electrical ircuit.
oltage 7 urrent relationshi for assive elements #for different in ut signals-s,uare% ram % saw tooth% triangular$
Important point an! !e inition:
There are two ty es of network elements 4$ !ctive elements 8$ (assive elements
2nter connection of two or more circuit elements is called a network
2f a network consists of a closed ath in which current can flow it is called acircuit
!ctive elements are those which su ly energy.
(assive elements are those which consume energy.
2n active elements there are two different ty es 4$ (ractical inde endent sources8$ &e endant sources.
There are three different assive elements.
o
4$ 3esistors 8$ 2nductor 9$ a acitor
Objective t#pe $%etion:
4.Give different ty es of active elements. 8.Name different ty es of assive elements. 9.Give the difference between ideal voltage source and ractical voltage source. e:.Give the difference between ideal current source and ractical current source. ;.Give voltage current relationshi for 3esistor. <.Give voltage current relationshi for 2nductor.=.Give voltage current relationshi for a acitor.>.?hat are energy storage elements@ +..3.2.T. ourse 'ile -----------------------------------------------------------------------8
-----------------------------------------------------------------------------------Network ThoeryA.Give the relations for energy stored in an inductor and ca acitor. 4B.!n 2deal current source in arallel with a resistor is re resented in terms of voltage source as CCCC 44.2f n e,ual resistors are connected in series then e,uivalent resistance is CCCCCCCCCCCCC 48.2f n e,ual resistors are connected in arallel then e,uivalent resistance is CCCCCCCCCCCCC 49.2f n e,ual ca acitors are connected in series then e,uivalent ca acitance is CCCCCCCCCCCCC 4:.2f n e,ual ca acitors are connected in arallel then e,uivalent ca acitance is CCCCCCCCCCCCC 4;.2f n e,ual inductors are connected in series then e,uivalent inductance is CCCCCCCCCCCCC 4<.2f n e,ual inductors are connected in arallel then e,uivalent inductance is CCCCCCCCCCCCC
Ea# T#pe $%etion:
4.E/ lain about different !ctive and (assive elements with their voltage current relationshi s.
Prob&em :
4.3educe the network shown below to a single voltage source in series with a resistor between terminals ! D +. +..3.2.T. ourse 'ile -----------------------------------------------------------------------9
+
8
Ω
++
9
Ω
8
Ω
8
Ω
9! 8! 4B.48. ;.
-----------------------------------------------------------------------------------Network Thoery8.'ind the e,uivalent resistance between the terminals ! D + in the following network. The students are further advised to solve different roblems in the Te/t +ooks mentioned.
Previo% E'amination (%etion :
4.&etermine urrents and oltages of the resistances in the following network usingsource transformation. +..3.2.T. ourse 'ile -----------------------------------------------------------------------:
;
Ω
9
Ω
9
Ω
9
Ω
9
Ω
4
Ω
4
Ω
:
Ω

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