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Why do the USB 3.0 ports need a power cable? According to USB specification, a host (computer) should be able to deliver some power over USB cable. This decision was made by USB consortium on purpose in order to simplify connecting small devices without a need for additional cable.
Most computer USB ports supply 5V of electricity with a maximum current of 0.5A. This amount of current is standard across the majority of computers and means the overall power output will be 2.5 Watts at best. Later USB designs bring that current up to 0.9A.
Why do the USB 3.0 ports need a power cable? According to USB specification, a host (computer) should be able to deliver some power over USB cable. This decision was made by USB consortium on purpose in order to simplify connecting small devices without a need for additional cable.
Ports that support USB-BC, USB-PD, or some vendor specified protocol can provide more power. And most any port on a computer that supports USB 2.0 or USB 3.0 will support more power with one of these protocols. 1.5 amps from most any USB-A or USB-C port is common. 2.4 amps . . . Read more
Unpowered. Non-powered, or passive, USB hubs do not have an external power source and only pull power from the computer’s USB port. Unpowered hubs have compatibility issues with devices that need more power to operate than the hub can provide.
A USB’s electric current is allocated in units of 100 mA up to a maximum total of 500 mA per port. Therefore, a compliant bus powered hub can have no more than four downstream ports and cannot offer more than four 100 mA units of current in total to downstream . . . Read more
The main difference between USB 2.0 and USB 3.0 is speed. USB 2.0 has a max speed of 480Mbps (Mega bits per second,) which converts to 60MBps (Mega Bytes per second.) … USB 3.0 has a much higher max speed of 5Gbps (Giga bits per second, ie 1024Mbps) which translates . . . Read more
Is USB 3.0 backwards compatible? … You can plug a USB 2.0 device into a USB 3.0 port and it will always work, but it will only run at the speed of the USB 2.0 technology. So, if you plug a USB 3.0 flash drive into a USB 2.0 port, . . . Read more
No, most usb c hub do not need external power, I did not see any hub need external power. Now the hub on market, some of them with battery, they even have charging port. I just tried a Alxum 12-in-1 Dual Monitor USB C Hub , actually I use them . . . Read more
The voltage must be within 7 to 24 or 7 to 40 Volts DC, depending on the specifications of the USB hub. The power supply must convert AC to DC (no AC output). The power rating is equal or greater to the requirements of the hub.
