Networks Analysis And Synthesis
A passive network is one which contains

No source of e.m.f. in it
Only variable resistances
Only two sources of e.m.f. in it
Only some sources of e.m.f. in it

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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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