ch03 - CHAPTER 3 METHODS OF ANALYSIS Scientists study the...

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75 C H A P T E R METHODS OF ANALYSIS 3 Scientists study the world as it is, engineers create the world that never has been. —Theodore von Karman Enhancing Your Career Career in Electronics One area of application for electric circuit analysis is electronics. The term electronics was orig- inally used to distinguish circuits of very low current levels. This distinction no longer holds, as power semiconductor de- vices operate at high levels of current. Today, electronics is regarded as the science of the motion of charges in a gas, vac- uum, or semiconductor. Modern electronics involves tran- sistors and transistor circuits. The earlier electronic circuits were assembled from components. Many electronic circuits are now produced as integrated circuits, fabricated in a semi- conductor substrate or chip. Electronic circuits find applications in many areas, such as automation, broadcasting, computers, and instru- mentation. The range of devices that use electronic circuits is enormous and is limited only by our imagination. Radio, television, computers, and stereo systems are but a few. An electrical engineer usually performs diverse func- tions and is likely to use, design, or construct systems that incorporate some form of electronic circuits. Therefore, an understanding of the operation and analysis of electronics is essential to the electrical engineer. Electronics has become a specialty distinct from other disciplines within electrical engineering. Because the field of electronics is ever advancing, an electronics engineer must update his/her knowledge from time to time. The best way to do this is by being a member of a professional organization such as the Institute of Electrical and Electronics Engineers Troubleshooting an electronic circuit board. Source: T. J. Mal- oney, Modern Industrial Electronics, 3rd ed. Englewood Cliffs, NJ: Prentice Hall, 1996, p. 408. (IEEE). With a membership of over 300,000, the IEEE is the largest professional organization in the world. Members benefit immensely from the numerous magazines, journals, transactions, and conference/symposium proceedings pub- lished yearly by IEEE. You should consider becoming an IEEE member.
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76 PART 1 DC Circuits 3.1 INTRODUCTION Having understood the fundamental laws of circuit theory (Ohm’s law and Kirchhoff’s laws), we are now prepared to apply these laws to develop two powerful techniques for circuit analysis: nodal analysis, which is based on a systematic application of Kirchhoff’s current law (KCL), and mesh analysis, which is based on a systematic application of Kirchhoff’s voltage law (KVL). The two techniques are so important that this chapter should be regarded as the most important in the book. Students are therefore encouraged to pay careful attention. With the two techniques to be developed in this chapter, we can analyze almost any circuit by obtaining a set of simultaneous equations that are then solved to obtain the required values of current or voltage.
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