Hi All,
I agree with all the replies in some or the other way. It is true that for a system our gain should be optimum and yes it is the gain that decides efficiency as it had been also mentioned in previous comments but yes in practical systems gain needs to be of optimum level because non linearities would come into existance.
Also it is a fact that high power is one of the techniques to increase the gain efficiency of the system.So there shouldn’t be any of the confusions now. I hope it is helpful to you….
Regards