The maximum power transfer theorem states:
The power transferred from a supply source to a load is at its maximum when the resistance of the load is equal to the internal resistance of the source.
Hence, in Fig when R = r the power transferred from the source to the load is a maximum.
Typical practical applications of the maximum power transfer theorem are found in stereo amplifier design, seeking to maximise power delivered to speakers, and in electric vehicle design, seeking to maximise power delivered to drive a motor.
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