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Maximum Power Transfer Theorem

 This theorem is particularly useful for analyzing communication networks because in communication engineering it is usually desirable to deliver maximum power to a load. Electronic amplifiers in radio and television receivers are designed to do this an it sues not matter than an equal amount of power is lost in the process. Obviously, it is important to make maximum use of power available for driving a loud speaker. One can readily agree, however, that such a situation would not be tolerable in power engineering because in this situation reticence of transmission will be very poor where as in this case goal is high efficiency and not maximum power transfer.

As applied to d.c. networks, this theorem may be stated as follows:

A resistive load, served through a resistive network, will abstract maximum power when the load resistance value is the same as the resistance “viewed by the load as it looks back into the network “is also called the output resistance of the network, or the resistance presented to the output terminals by the network. It is the resistance we called R in explaining Thevenin’s theorem. The load resistance R1 will draw maximum power when it will be equal to R i.e. RL= R.

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