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Basic Laws

الكلية كلية الهندسة     القسم  الهندسة الميكانيكية     المرحلة 1
أستاذ المادة فرح فاهم السرحان       05/07/2018 17:10:01
‎2.1 Introduction ‎
In Chapter 1, basic concepts in an electric circuit is introduced. To actually ‎determine the values of these variables in a given circuit, it requires understanding some ‎fundamental laws that govern electric circuits. These laws, known as Ohm’s law and ‎Kirchhoff’s laws, form the foundation upon which electric circuit analysis is built. In ‎addition to these laws, we shall discuss some techniques commonly applied in circuit ‎design and analysis. ‎
‎2.2 Network Terminology
‎ In this section, we shall define some of the basic terms which are commonly ‎associated with networks.‎
‎1. Network: Any arrangement of the various circuit elements is called an electrical ‎network. Such a network is shown in the Fig. 2.1.‎
‎2. Network Element: Any individual circuit element with two terminals which can be ‎connected to other circuit element is called a network element. Network elements can be ‎either active elements or passive elements. ‎
‎3. Branch: A part of the network which connects the various points of the network with ‎one another is called a branch. In the Fig. 2.1, AB, BC, CD, DA, DE, CF and EF are the ‎various branches. The branch may consist of more than one element.‎
‎4. Junction Point: A point where three or more branches meet is called a junction point. ‎Points D and C are the junction points in the network shown in the Fig. 2.1.‎
‎5. Node: A point at which two or more elements are joined together is called node. The ‎junction points are also the nodes of the network. In the network shown in the Fig. 2.1, A, ‎B, C, D, E and F are the nodes of the network.‎
‎6. Mesh (or Loop): Mesh (or Loops) is a set of branches forming a closed path in a ‎network in such way that if one branch is removed then remaining branches do not form a ‎closed path. In the Fig. 2.1 paths A-B-C-D-A, A-B-C-F-E-D-A, D-C-F-E-D etc are the ‎loops of the network.‎
‎ In this chapter, the analysis of d.c. circuits consisting of pure resistors and d.c. ‎sources is included. ‎

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