A fundamental concept that i have learned from basic electrical circuit study is to receive maximum power by a load of resistance
RL from a source the necessary condition is
RL = Rin where
Rin is the input resistance seen by the load. This is called maximum power transfer theorem. But the efficiency in this condition is 50%.
Then it is said that, the maximum power transfer condition is the best choice to transmit signal in communication system. Since we need the signal with maximum strength at the receiving end.
But in power transmission we target to receive as much higher efficiency as possible. That's why maximum power transfer condition is not a desirable feature in this case.
My question is, whether the above two paragraphs are true or not? If true then, why maximum receiving power wouldn't be a desirable feat for electricity transmission?