Networks Analysis And Synthesis
Thevenin resistance Rth is found

by removing voltage sources along with their internal resistances
between same open terminals as for Etk
by short-circuiting the given two terminals
between any two ‘open’ terminals

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Networks Analysis And Synthesis
Kirchhoff s current law states that

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

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