Many citizenry retrieve – and some still find – USB - one C perplexing because of the variety of data criterion supported by different hosts ( computers , wandering phone , etc . ) and devices ( headphones , other reckoner , gaming systems , driveway , and so forth ) . But mixed in there was the emergence that a USB - coke overseas telegram has no preferred endandcan hold power over any cable’s length , often at high wattages necessary for charging laptops or recharge USB assault and battery pack .
When you plug away in multiple devices that can provide power over USB - C , will you fry a computer or other equipment ? Will their voltages combine for quicker point ? If they ’re compete to burden , which one “ come through ” when you have two germ with different outturn , like 15 watts and 100 watts ?
The answer is that USB - C sorts it all out . The controller on each gadget that handles negotiation over the cable with other connected devices also negociate business leader flow , as big businessman has to spend over certain pathways within the cable . This should typically lead to a host gadget choosing the highest available mightiness , though there ’s no way to be sure .
One lecturer trace a scenario in which they had secure into their MacBook Pro a dock that provided 65W over USB - C even though the information processing system could charge at up to 95W. ( All USB - C cables have to extend a minimum of 60W , but ones that are also rated for Thunderbolt 4 must pass 100W. However , chargingdevicesaren’t required to offer a lower limit power . )
As expected , when they plugged both in , the laptop computer received 95W from the like a shot attach transcriber , decline the power feed from the bobtail . If the MacBook Pro ’s charger were unplugged , it would straightaway switch to receive power from the dock through a sub - second negotiation .
Now record our passport forbest MacBook chargerandbest iPhone courser .
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We ’ve compiled a list of the questions we get ask most oftentimes , along with solvent and links to newspaper column : read our tops FAQ to see if your question is cover up . If not , we ’re always look for new problems to clear ! e-mail yours tomac911@macworld.com , including screen captures as appropriate and whether you require your full name used . Not every interrogative will be reply , we do n’t respond to email , and we can not render direct troubleshooting advice .
