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ECE201_Lecture04

# ECE201_Lecture04 - E E201 Linear Cir cuit Analysis I L...

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1 EE201 Linear Circuit Analysis I Lecture 4. Topics: Kirchoff’s Laws, single loop / node circuits 1. series circuit – elements connected in series or “head to toe” 2. parallel circuit – elements connected in parallel i.e. head to head, toe to toe node: common connection points – a point branch: a two-terminal element (like tree branches) – a line Example 1 . Find parallel & series branches, nodes.

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2 3. Kirchhoff’s Current Law (KCL) (1) Form 1 Σ i entering a node = 0 for all t . i 1 + i 2 + … + i n = 0 Example 2. (2) Form 2 Σ i leaving a node = 0 for all t . i 1 + i 2 + … + i n = 0 Example 3. 2A i x 1A 1A + 2A + i x = 0 i x = -3A -2A i x 1A 1A + (-2A) + i x = 0 i x = 1A
3 (3) Form 3 Σ i entering a node = Σ i leaving a node for all t . i 1 + i 3 + … = i 2 + i 4 + … Example 4. * There is only ONE KCL. It can be expressed in three different forms. * Use one of the 3 forms at a time. Pick your favorite. * Form 3 is most intuitive to me. (no charge accumulates at a node) Example 5.

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ECE201_Lecture04 - E E201 Linear Cir cuit Analysis I L...

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