That sentence from the textbook is poorly worded, see https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem#Maximizing_power_transfer_versus_power_effici

That sentence from the textbook is poorly worded, see https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem#Maximizing_power_transfer_versus_power_efficiency https://en.wikipedia.org/wiki/Maximum_power_transfer_theorem... Yes, power is lower when efficiency is greater all other things equal, but you work around that by not making all other things equal.