This theorem is applicable only when the load is variable otherwise choose the minimum internal impedance of the source which gives maximum current through the fixed load.

This is just the overview of this theorem. It has some cases for different types of load. Here i am showing you only for resistive load…..

Suppose we have a voltage source or battery whose internal electrical resistance is Ri and a load resistance RL is connected across this battery. Maximum Power Transfer Theorem determines the value of resistance RL for which the maximum power will be transferred from source to it. Actually the maximum power, drawn from the source, depends upon the value of the load resistance. There may be some confusion let us clear it.

Power delivered to the load resistance,

To find the maximum power, differentiate the above expression with respect to resistance RL and equate it to zero. Thus

Thus in this case, the maximum power will be transferred to the load when load resistance is just equal to internal resistance of the battery.

This is what the maximum power transfer theorem says.

If you have any query regarding this theorem then contact me..

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