USB Plug - Current / Voltage

[forkconfig]

See the following specs and product:


Specification Current Voltage Power
USB 1.0 50 mA 5 V 0.75W
USB 2.0 500 mA 5 V 2.5 W
USB 3.0 900 mA 5 V 4.5 W
USB 3.1 2 A 5 V 10 W
USB 3.1 5 A 12 V 60 W
USB 3.1 5 A 10 V 100 W

**broken link removed**


Okay so here is my question...
We know current is drawn so as long as the product is rated for more than 5 A were okay...but voltage does matter! Does that mean that this product can mess up my devices as we move to USB 4 and so on? (Since the voltage is changing)

Also, I remember hearing from an engineer at an IEEE workshop that it doesn't matter what the voltage rating was for one of the devices I was working with because it'll convert it down. Just for general knowledge, do laptops chargers have this? How can you tell if it's okay if the voltage is higher?

 

[Audioguru]

This product provides 5V at up to 1.1A from each USB output. It cannot be used for USB 3.1.
All laptops I have seen require 19V at 1A for charging. This 5V product cannot be used for them.

 

[forkconfig]

Just for more general knowledge...
I know as long as the current is higher on the source I'm good, but what about voltage? If voltage is lower/higher that means internal circuitry could burn out. Am I correct?

 

[Audioguru]

The USB power source is designed to feed the charging circuit in a cell phone. Most cell phones are charged from 5V at 500mA so this product will be fine.
I have a toy helicopter that can be charged from this product. Its 5V uses about 35mA.

If you feed 12V to an item that uses 5V then it will probably burn out.