Maximum power transfer theorem deals with the power transferred to the load on a circuit with a network of various sources or components on it. The maximum power transfer theorem defines the condition under which the maximum power is transferred to the load in a circuit.
The Maximum Power Transfer Theorem states that:
The power transferred from a source or circuit to a load is maximum when the resistance of the load is made equal or matched to the internal resistance of the source or circuit providing the power to the load.
Applications of Maximum Power Transfer Theorem:
The Maximum Power Transfer Theorem has a wide range of usage on real life situation. The theorem is used to maximize the power output to a load from any circuit. So they can be used to design circuits where the maximum output performance is desired for example to match an Amplifier with a Loudspeaker to yield maximum power to the speaker and thus produce maximum sound.
In some situations Transformer Coupling are also used to yield maximum power to the load when the matching of Load and Source impedance is not possible for example is the amplifier is of 1000 Ohms and the speaker if of 10 ohms.
The application of Maximum Power Theorem is done only under the conditions when the maximum performance is desired over the overall efficiency of the circuit because as we discussed above the efficiency of a circuit under maximum power transfer condition is only 0.5. So, Maximum power transfer theorem is applied in radio electronics; for example: In Antenna Signal amplifier for radio and TV receivers; and various other fields where maximum performance is required but the maximum efficiency is not desired.
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