And neither necessarily means maximum efficiency.
I get confused about the max power transfer thereom. Since if the source impedance is zero ohms, then it is most efficient but it's not maximum power transfer (you would also think that the load would be getting the most power then as well but apparently there is some difference between the two). I have not been able to entirely wrap my head the difference between the two though.
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Maximum power != maximum current != maximum voltage != maximum efficiency (necessarily).