# Chapter 2 - Chapter 2 Basic laws SJTU 1 Some Basic Concepts...

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SJTU 1 Chapter 2 Basic laws

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SJTU 2 Some Basic Concepts Branch----- A branch represents a single element such as a voltage source or a resistor. {But usually we think a branch as a path flowing the same current. So maybe includes more than one element.}
SJTU 3 Node------- A node is the point of connection between two or more braches Loop------- A loop is any closed path in a circuit. Mesh------ A mesh is a loop which does not contain any other loops within it. Some Basic Concepts

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SJTU 4 KIRCHHOFF’S LAWS Kirchhoff’s Current Law (KCL): The algebraic sum of currents entering a node (or a closed boundary) is zero. (Based on the law of conservation of charge) The sum of the currents entering a node = the sum of the currents leaving the node. = = N k k i 1 0 5 2 4 3 1 5 4 3 2 1 0 i i i i i or i i i i i + = + + = - + + -
5 KCL also applies to a closed boundary . 1 i 2 i 3 i 4 i 5 i 0 0 5 4 3 2 1 7 6 3 2 1 = - - - - = - - - - i i i i i or i i i i i so 7 i 6 i Note: 1) KCL is available to every node at anytime. 2) KCL is related only to the currents instead of the elements.

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## This note was uploaded on 04/06/2010 for the course EE 102 taught by Professor Pingli during the Fall '08 term at Shanghai Jiao Tong University.

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Chapter 2 - Chapter 2 Basic laws SJTU 1 Some Basic Concepts...

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