to charge an iPhone or iPad, or any other rechargeable electronic gadget anywhere for that matter, may seem one of the least complex you can undertake yourself. Just plug it in and wait – how hard can it be?
But the fact is that the time it takes to download will vary greatly and can differ as much as 100 percent between two different ways. Here is how to speed up charging as much as possible.
You can see how much power your iPhone or iPad get out of the Mac, choose Apple -> About this Mac -> System Report and click on USB. Here you see a Mac Pro (2013) provides 2.1 amps.
If you have a newer Mac, it is therefore usually good to have the iPhone plugged in, preferably directly into a free uSB connector. With an older Mac recommended a stand-alone charger. Case is always recommended to use Apple's original charger.