won't any usb port charge a device

September 2, 2019 at 07:55:40
Specs: Windows 10
Won't any usb port (even in a hub) charge devices (like a cell phone and MP3 player) even if slowly? Will they charge devices at the same speed as the USB ports on the computer itself?

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#1
September 2, 2019 at 09:20:09
I think in general as long as a port can maintain its rated 5 volts then charging will occur. You can think of voltage as 'pushing' the current. If voltage drops too low the current won't flow and charging won't occur.

USB 1.0 and 2.0 ports can provide .5 amps; USB 3.0 up to .9 amps. If you have multiple devices connected through a non-powered hub the current must be divided between the devices connected to the hub.

Many devices come with quick (wall) chargers that provide around 2 amps. 1.0, 2.0 and 3.0 ports can't provide that kind of current so charging will be slower. There is a new 3.1 standard that apparently can provide up to 20 amps but I don't know how common it is.

If you're going through a hub to charge a device make sure it's a powered hub but for quickest charging you're probably better off using a wall charger.

message edited by DAVEINCAPS


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#2
September 2, 2019 at 10:07:24
As DAVE refers to, the device to be charged shouldn't exceed the stated current limit of the port itself. Damage to the port could occur (though the computer should give some indication of this). If the port is already damaged, then little or no charging would occur.

As DAVE mentions, it's generally best to use the "wall-wart" (AC adapter) that the device came with.


"Channeling the spirit of jboy..."

message edited by T-R-A


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