How much USB power does a device use or provide? Apple Computers and Displays: Powering peripherals through USB
Posted by jpluimers on 2012/05/28
Apple peripheral devices may request more than 500 mA (Milliamps) at 5 V (Volts) from a port to function or to allow for faster charging. Such Apple peripheral devices include:
- Apple MacBook Air SuperDrive (when connected to supported computers)
- Aluminum Wired Keyboard*
Open System Profiler to find more information about peripheral power requirements, or contact the manufacturer of your peripheral. For the most accurate information about power usage, make sure your device is connected directly to your Apple computer or display before opening System Profiler.
All this because of the iPad charging challenge.