Thevenin’s theorem

Thevenin’s theorem

steps

1. Remove the branch impedance, through which current is required to calculate.
2. Calculate the voltage across the open circuited terminals. This voltage  is thevenin’s equivalent voltage Vth.
3. Calculate the equivalent impedance Zeq as viewed  through  the two terminals of the branch from which current is to be calculate by  removing  that branch impedance and  replacing all the independent sources by their internal impedance.
4. The required current through the branch is given by,   I =(VTH/(ZL+Zeq))