Resolved MBA charger sizes

alphaod said:

The MacBook Air normally comes with a 45W adapter.

Apple makes two more capacities, the first one at 60W used on the 13" MacBook and MacBook Pro; the second charger is at 85W and is used on the 15" and 17" MacBook Pro.

You can certainly use the 60W and 85W adapters on your MacBook Air; it will not charge the computer any faster; it auto senses the computer that it's connected to and will adjust the output current automatically. The drawback to using the other two adapters are noticeably larger [and heavier] than the 45W adapter if you do travel.

If you're looking for another adapter, I would consider buying the 85W to keep at home. It is larger and heavier, but will charge any MacBook, MacBook Pro, or MacBook Air as needed. When charging the MacBook Air, the 85W will run cooler.

Click to expand...

Puevlo said:

You can use it but it definitely won't charge faster. It will still only charge at a 15 watt rate. Basically the electrons in the 45 watt charger are too big to fit into the MBA. So although they are larger it is harder for them to fit thus making it charge at the same rate.

Click to expand...

Puevlo said:

That's what a transformer is for. It resizes the electrons thus changing their voltage.

Click to expand...