3 ms·

I thought you can't charge apple devices with different usb devices? I have an apple tablet at my work and my pc does not charge it, I have to use my friend's m

• lloeki 14y ago
  Per spec USB2 output max 500mA per port. This is enough to charge an iPad when it's asleep, but as soon as the screen is on it will stop charging to power itself. The wall charger and Macs include a non-standard trick (a resistor on the data pins in the wall charger, probably some active negotiation on Macs) to output up to two full amps. Higher charge rates are part of the USB3 spec, but this would require both devices to implement it, and I don't know if it's even a mandatory part of the spec. So, plug your iPad on a PC and it will charge, just slower, and only when sleeping.
• whiskers 14y ago
  You'll probably find that it does trickle charge (though doesn't own up to it), but just barely. Your PC likely isn't delivering enough current via USB to charge an iPad. (I think it needs a 1A supply and the USB spec only requires 500mA or something like that).