Networks Analysis And Synthesis
The number of independent equations to solve a network is equal to

The number of branches
Sum of the number of branches and chords
The number of chords
Sum of number of branches, chords and nodes

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Networks Analysis And Synthesis
In Thevenin’s theorem, to find Z

All independent voltage and current sources are short circuited
All independent voltage sources are open circuited and all independent current sources are short circuited
All independent current sources are short circuited and independent voltage sources are open circuited
All independent voltage sources are short circuited and all independent current sources are open circuited

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