Hello, ask, in the home of the lighting circuit, the bus, the main line, socket line, light line, can walk in the same trunking?
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So long ah, give you that 5V is the voltage, many people only look at this, there is a call is the current, this is the key, because the voltage how you branch, are 5V, but the current will slowly weaken, You should go to a USBHUB with an external power supply, but also to clearly see the current marked as 2A, so you put the extension cord inserted in it, then plug it into the computer above, you can have such a situation, often Get a USBHUB, no external power supply, and then consequently to the above, the results do not move, with you this is the same, the voltage does not matter.
Winter tight, summer sagging, the principle is thermal expansion and contraction. Summer shelves do not too tight, winter will pull off.