Networks Analysis And Synthesis
Application of Norton’s theorem to a circuit yields

Equivalent impedance
Equivalent current source and impedance in series
Equivalent current source
Equivalent current source and impedance in parallel

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Networks Analysis And Synthesis
Kirchhoff s current law states that

Hebraic sum of the currents meeting at the junction is zero
Net current flow at the junction is positive
Total sum of currents meeting at the junction is zero
No current can leave the junction without some current entering it

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