We deal only with passive, linear network elements. Ee6201 circuit theory two marks questions and answers. With lucid and brief theory, this textbook provides thorough understanding of the topics of this subject. Circuit theory and transmission lines, 2nd edition avaxhome. A circuit is a series of electrical devices connected in a complete circle, causing current, electrons, to flow through it. The result is a simple series circuit with a current equal to i. A circuit is said to be planar, if it can be drawn on a plane surface without crossovers. March16,20 onthe28thofapril2012thecontentsoftheenglishaswellasgermanwikibooksandwikipedia projectswerelicensedundercreativecommonsattributionsharealike3. Ideal voltage source ideal current source, current divider with two parallel resistances, kirchhoffs laws kirchhoffs current law, application of. Kuh meant for the undergraduate students taking the course on circuit theory, this book provides a comprehensive exposure to the subject. Substitution theorem gives us some special insights in circuit behavior. In circuit theory, thevenins theorem for linear electrical networks states that any combination of voltage sources, current sources, and resistors with two terminals is electrically equivalent to a single voltage source v in series with a single series resistor r.
Circuit theory i superposition the superposition principle states that the voltage across or current through an element in a linear circuit is the algebraic sum of the voltages across or currents through that element due to each independent source acting alone. We have the circuit on the right, with a driving voltage us 5 v, and we want to know u and i. It is useful for analyzing complex electric circuits by converting them into network graphs. Have a good understanding of the basics of circuit theory and acquire engineering analytic techniques and skills. An electrical circuit is a network consisting of a closed loop, giving a return path for the current through a switch. Circuit theory i thevenins theorem thevenins theorem states that a linear twoterminal circuit can be replaced by an equivalent circuit consisting of a voltage source v th in series with a resistor r th where v th is the open circuit voltage at the terminals and r th is the input or equivalent resistance. 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. Apart from providing a conventional introduction to ac theory however, there is a subtext. Solution of midterm exam questions spring 201516 file.
Using the superposition theorem, determine the current through resistor r 2 for the network in fig. We have a circuit as in the figure right, with a source current i 0. Circuit, we will combine the resistor and the source on one side of the. A twopole circuit such as this one a thevenin equivalent circuit delivers maximum output power when the load resistor connected equals the internal resistance. R th is the input or equivalent resistance at the terminals when the. Circuit theory 3a electrical networks and network theorems different kind of network elements. Circuit theorems introduction the previous chapter showed that. C dutta roy, department of electrical engineering iit delhi. Electric circuit theorems are always beneficial to help find voltage and currents in multi loop circuits.
Now, let us discuss about the basic terminology involved in this network topology. Chapter 3 nodal and mesh equations circuit theorems 352 circuit analysis i with matlab applications orchard publications 3. Demonstrate that the superposition theorem is not applicable to power levels. These fundamental theorems include the basic theorems like superposition theorem, tellegens theorem, nortons theorem, maximum power transfer theorem and thevenins theorems. Pages in category circuit theorems the following 25 pages are in this category, out of 25 total. Superposition states that the voltage across or current through an element in a linear circuit is the algebraic sum of the voltage across or currents through that element due to each independent source acting alone. Brief course description the course introduces concepts, laws and their applications for dc and ac circuits. Basic concept of circuit theory linkedin slideshare. Circuittheorems linearityproperty superposion sourcetransforma7ons theveninstheorem nortonstheorem maximumpowertransfer. R the total resistance in the circuit is then rtot 1010.
Circuit theory nptel online videos, courses iit video. Ele 1101 circuit theory the college of engineering. Chapter 4 circuit theorems free download as powerpoint presentation. Electric circuit analysis with the help of kirchhoffs laws usually involves.
Chapter 3 nodal and mesh equations circuit theorems. The helmholtztheveninnorton theorem is widely used in circuit calculations. When the switch is actuated, the load activates and the current gets a path to complete the circuit from a high potential level to the opposite low potential level. Circuit theory is an approximation to maxwells electromagnetic equations by assuming o speed of light is infinite or dimension of the circuit is much smaller than wavelength of voltagecurrent waveforms. Now, we will find the equivalent circuit for two terminal resistive circuit with sources. International system of units, negative and positive polarities of battery, potential difference, resistance in series, inductance, capacitance, types of sources. If we combine a tree and its corresponding cotree, then we will get the original graph. Circuits have given us electric lights, mri scanners, and washing. Pdf a scheme for analysis and design of analogue circuits. Therefore, the basic electric circuit theory course is the most important course for an electrical engineering student, and always an excellent starting point for a beginning student in electrical engineering education. Circuit globe circuit theory substitution theorem substitution theorem substitution theorem states that the voltage across any branch or the current through that branch of a network being known, the branch can be replaced by the combination of various elements that will make the same voltage and current through that branch. Resonance and coupled circuitsseries and parallel resonance. First, we turn the voltage source of 20v off shortcircuit.
Circuit theory is an approximation to maxwells electromagnetic equations. In addition to circuit theorems, we discuss the concepts of. Circuit theory 1b more solved problems related to dc. In order to determine the effect of the 36 v voltage source, the current source must be replaced by an opencircuit equivalent as shown in fig. Active and passive, linear and nonlinear, lumped and distributed. Kirchhoffs laws kirchhoffs circuit laws are two equalities that deal with the conservation of charge and energy in electrical circuits.
Problems and examples on circuit theory and electronics. A circuit is said to be nonplanar, if it cannot be drawn on a plane surface without a crossovers. This was true in the past, but given the modern capabilities of matlab and mupad, the importance of the. Circuit theoryseries resistance wikibooks, open books. Lecture notes on dc network theory federal university, ndufu. This relates to the authors concerns as a scientist. Circuit theory 3b more network theorems, solved problems. In other words, the linear circuit looking into terminals ab can be replaced by an equivalent circuit consisting of a voltage source vth in series with an equivalent resistance rth, where vth is the open circuit voltage vn and. Enriched with rich pedagogy, this book is a useful tool for both students and teachers alike. These theorems use fundamental rules or formulas and basic equations of mathematics to analyze basic components of electrical or electronics parameters such as voltages, currents, resistance, and so on. Draw your new thevenin equivalent circuit plugging er th, th and. Circuit theory is an approximation to maxwells electromagnetic equations a circuit is made of a bunch of elements connected with ideal i. Free circuits theory books download ebooks online textbooks. Network topology is a graphical representation of electric circuits.
The voltage across the resistor in the circuit of figure 3. Circuit theorems this chapter provides a new powerful technique of solving complicated circuits that are more conceptual in nature than nodemesh analysis. The loop existing, around a current source which is common to the two. Thevenins theorem after french telegraph engineer leon charles thevenin2, and the. Circuit theory is also valuable to students specializing in other branches of the physical sciences because circuits are a good model for the study of energy systems in. Calculations like this are only necessary when trying to find out what is going on in one little part of the circuit. It presents basic units theory that enables students to understand and analyze circuits. Once we have the solution for each source, we can combine the results to obtain the total solution. The previous example can also be solved by superposition theorem.
Course objectives by the end of the course students should be able to. However, for the most part, the techniques assume linear components. Circuit theory 3a electrical networks classification. In it we do not prove any of the assertions that are made. Kirchhoffs current law kcl based on principle of conservation of electric charge. Gate preparation, nptel video lecture dvd, electronicsandcommunicationengineering, circuittheory, networktheorems, ohms law, kirchoffs laws, direct current circuit, dc circuit, alternating current circuit, ac circuits, resistors in series circuit, series circuit, resistor in parallel circuits, parallel circuits, mesh current method, node voltage method, dc and ac circuits analysis.
A circuit is made of a bunch of elements connected with ideal i. Superposition theorem, thevenin or helmholtz theorem and problems based on these. Statement of substitution theoremsubstitution theorem states that if an. The node voltages are governed by a matrix equation yv cu, where v is the node voltage column vector, y is the nodal conductance matrix of the circuit, u is the input column. This theorem is also used to prove several other theorems.
Ee6201 circuit theory sce 3 of 162 electrical and electronics engineering objectives. After extracting it from the pdf file you have to rename it to source. An extended frame for thevenin norton theorem ieee cass. Network analysis is the process of finding the voltages across, and the currents through, all network components. Conceptually, the method is fairly straightforward to write down, however, they are complicated to apply in practice. Introduction to network theorems in electrical engineering. Circuit theory network theorems exam study material for. A network, in the context of electrical engineering and electronics, is a collection of interconnected components. Since these theorems are applicable to linear circuits, we first discuss the concept of circuit linearity. Midterm examination solutions spring 201617 file 550.
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