3 ms·
Good questions! It's all in the USB Power Delivery [1] spec. The devices will do reasonable things. For example if you plug four power sources into the MacBook
by ageitgey 10y ago
Good questions! It's all in the USB Power Delivery [1] spec. The devices will do reasonable things.
For example if you plug four power sources into the MacBook Pro (one in each port), it will take power only from the source that is supplying the highest power.
Or if you plug a cell phone into a USB-C hub, it will suck as much power as it can to charge it's battery as quickly as possible. But if the hub needs more power temporarily to spin up a hard drive, the charging device can momentarily reduce it's power draw and then resume charging when the extra power is available again.
[1] http://www.usb.org/developers/powerdelivery/ http://www.usb.org/developers/powerdelivery/