IPhone can not use 66w fast charge, because it is not supported.
Apple's charging power is not so large, Apple supports Apple's official 5 watts of charging power, after upgrading the system, you can support Apple's own highest 20 watts of charging.
But even 20 watts of charging power, compared to 66 watts of charging power is still a lot worse, it is best not to use high-power charger to charge low-power mobile phones, otherwise there is a certain risk.
Yes, but you'd better not! Apple products such as iPhone or iPad support up to 30W fast charge, only the MacBook supports 66W fast charge.
If it is an iPhone or iPad, do not use 66 watts fast charge, it will hurt the battery of the machine, affecting the battery life.
If it is a MacBook, yes, the wattage is matched. For reference only
there is no problem
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66w can be used as an iPhone Ha, this is no problem at all. 2. Our iPhone has an IC management chip inside, which can dynamically adjust the current and voltage. The power can be adjusted from 0 to 20 watts.