Does each USB port on the motherboard have an independent amount of current?

Question

Electronics

Hello,
As far as I can imagine the USB specification, each USB 2.0 port can deliver 500mA. Let's say if the connected consumer needs 1A for his work, then the maximum that he will receive is 500mA. And be that as it may, the power supply of each port is independent, and a consumer connected to one port cannot reduce the consumer current in another port?
PS Forgive me for such difficulties, but there are a number of situations in which I tend to think that consumers influence each other, I can give an example in a comment to the answer.

Answer 1

Depends on the implementation of the specific card, but most often NO, it does not, and yes, it may depend on the load on the neighboring ports.

Answer 2

According to the specification, 0.5 A is really released for each USB-2, 0.9 A for USB-3, and even more for USB-C. In reality, on many mothers they are powered in pairs (one jumper for switching power from a common 5 V or 5 V duty room to a pair of adjacent ports) through a common resettable fuse, which (as I measured) works somewhere at 1 ... 1.5 A.
Parallel power supply from neighboring USBs happens in practice - for example, at a time when USB-3 did not yet exist, I saw external HDDs for sale with a special power tail equipped with two USB plugs (of which only one is signal). If you stick only one of them, the disk does not spin up, it clicks - there is not enough current.