Thread: PRS-600 PRS-600 - frozen dead??
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Old 10-23-2011, 05:19 AM   #12
Ashjuk
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Quote:
Originally Posted by ScalyFreak View Post
It does. One of the changes in the USB standard from 2.0 to 3.0 is in the voltage provided by the port.
Not so.

The voltage of USB 3.0 is still the same at 5v otherwise you could end up damaging USB 2.0 devices by plugging them in. What has changed is the total power available which is a combination of both voltage and current.

Ohm's Law gives the equation P(power) = V(voltage) X I(current). Therefore total power can be increased in two ways, either by increasing the voltage or by increasing the current. In the case of USB 3.0 the voltage has remained at 5v so the only difference is the current that is available to a device.

As a device plugged into a USB port will only ever draw the maximum current it was designed to take from a USB port it was designed for, the advantage of using a USB 3.0 port for a USB 2.0 device is nil. The only devices that will get a benefit from USB 3.0 are those designed to the USB 3.0 standard.

Seems to me that all Magnus needed to do was charge the device, and that could have been from any source.
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