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
“In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources”.The above statement is associated with

Norton’s theorem
Thevenin’s theorem
Superposition theorem
None of these

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