Objective: Verification of Maximum power transfer theorem.
Maximum power is transferred from a source of given voltage and an internal impedence to the load impedence ZL in a circuit (Fig.-1) under three conditions.
(A) When only XL is adjustable:
Under this condition the power consumed by the load (I2*RL) is maximum, when I is maximum, since RL is constant.
This means that if the load reactance(XL) is made equal magnitude and opposite in sign to the internal reactance(Xi), the power transferred is maximum.
(B) When only RL is adjustable:
From equation (1) in section (a), one may write,
Differentiating the equation ( 3 ) w.r.t RL and equating to zero, one obtains.
(C) When both RL and XL are adjustable:
Under this condition both equation (2) are valid simultaneously and one obtains.