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its very simple to solve a thevinien circuit first open the terminal across which we have ti calculate the voltage
suppose in a circuit if we have to cakculate across 5ohm then open it
then calculate the rth by open all the independent current source and close all the voltage source...........


after then calculate the voltage
by using nodal
take one as zero and another as vth
calculate the vth


then equivalent circuit is drawn.. in which the load reristance and the equivalent reristance is put in series....

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Are there any restrictions for the use of circuit elements in Thevenin's theorem verification?

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