if I buy a 85w mag safe power adapter for my MacBook Air 2017 will it be fine?
if I buy a 85w mag safe power adapter for my MacBook Air 2017 will it be fine?
MacBook Air 13″, macOS 10.15
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Yes.
The charger rating indicates only its maximum power output - in this case 85W
The system power rating indicates its maximum power draw - in this case, 45W
As long as the charger can support the maximum requirement of the system you'll be fine. The charger will only output what the system calls for and is quite happy to output 45W even though it can output more.