Concept Of Maximum Power Transfer Theorem In Electrcial networks :---

Some times we need to transfer Maximum power from source side to load side ,then we have to apply Maximum Power Transfer Theorem in given circuit . But to gain  Maximum Power Transfer at load side we have to compermise with efficiency of the system ,i.e during 
Maximum Power Transfer  overall efficiency of the circuit is only 50% .

 Let a circuit in which we have to find a condition for Maximum Power Transfer  
 

To transfer  maximum power required condition is 

       load resistance = source resistance

  

 and maximum power  Pmax= (Vs)^2/4*Rs