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Note for Circuit Theory - CT by Abhishek Kumar

  • Circuit Theory - CT
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.co m For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html lus EE6201 - Circuit Theory - Regulation 2013 - Lecture Notes by Vidyarthiplus Team - www.Vidyarthiplus.com ww w. Vi dy art hip UNIT I BASIC CIRCUITS ANALYSIS For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html

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For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html .co m INTRODUCTION art hip BASIC ELEMENTS & INTRODUCTORY CONCEPTS lus 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 determine the 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. 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, passive and active elements. dy 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. Vi 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. ww w. Bilateral Element: Conduction of current in both directions in an element (example: Resistance; Inductance; Capacitance) with same magnitude is termed as bilateral element. For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html

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For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html plu s .c om Unilateral Element: Conduction of current in one direction is termed as unilateral (example: Diode, Transistor) element. ww V Linear and Nonlinear Circuits thi Meaning of Response: An application of input signal to the system will produce an output signal, the behavior of output signal with time is known as the response of the system Non-Linear Circuit: Roughly speaking, a non-linear system is that whose parameters change with voltage or current. More specifically, non-linear circuit For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html

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For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html hip s .c om does not obey the homogeneity and additive properties. Volt-ampere characteristics of linear and non-linear elements are shown in figs. 3.2 - 3.3. In fact, a circuit is linear if and only if its input and output can be related by a straight line passing through the origin as shown in fig.3.2. Otherwise, it is a nonlinear system. idy KIRCHHOFF’S LAWS art Potential Energy Difference: The voltage or potential energy difference between two points in an electric circuit is the amount of energy required to move a unit charge between the two points. w. V Kirchhoff’s laws are basic analytical tools in order to obtain the solutions of currents and voltages for any electric circuit; whether it is supplied from a direct-current system or an alternating current system. But with complex circuits the equations connecting the currents and voltages may become so numerous that much tedious algebraic work is involve in their solutions. ww Elements that generally encounter in an electric circuit can be interconnected in various possible ways. Before discussing the basic analytical tools that determine the currents and voltages at different parts of the circuit, some basic definition of the following terms are considered. For more Anna University Study Materials, search here : http://www.vidyarthiplus.com/search.html

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