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Introduction and Simple Circuit (2/11/04) Basic Concepts: Ideal voltage/current sources: provide prescribed voltage/ currents the prescribed values are not affected by load. ideal voltage source: output voltage does not change with current; infinite internal resistance ideal current source: output current does not change with voltage; zero internal resistance

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Branch: any portion of a circuit with two terminals Node: a junction of two or more branches

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Loop: any close connection of branches Mesh: a loop that does not contain other loops

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Electric Charge: fundamental quantity of electricity. The smallest charge: electron, -1.6 x 10 -19 Coulomb (C) Current: Continuous flow of charges gives rise to electric current, which requires a close loop circuit. Basic Concepts: Cont Amperes=C/s

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Kirchhoff’s current law (KCL) The sum of the current at a node must equal zero, i.e., the current flowing into a node must equal to the current flowing out off the node. i =i 1 +i 2 +i 3

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