Maximum Power Transfer Theorem

 Maximum power transfer theorem

The maximum power transfer theorem transfers maximum power from the source to the load only when the load is variable otherwise choose the minimum internal impedance of the source which gives maximum current through the fixed load.

 

Category 1: R_S is fixed and R_L is Variable

So we get to know about the load power. Using this we can easily find the load power and load resistance.

Also, we can find the efficiency. Where efficiency is the ratio of the output power to the input power.

 

Category 2: 

Case 1: R_L  is variable and X_L is fixed.

Case 2: When X_L is variable and R_L is fixed

Here at this stage, the source will deliver maximum power to the load.

Case 3: When X_L is variable and R_L is variable

Category 3: When R_L is purely resistive

As X_L = 0 , we get ,