usb-2 & usb-3 power issue
I need some technical info on using USB-2 on a MacBook Air with USB-3. The basis question is how much can I safely use and what is the best hub for the USG-2. All things may be going smoothly until I plug in the remote DVD player. Sometimes it just stops the computer; sometimes I get a notice to remove the unit taking so much power; sometimes it hums loudly! The icon never gets to the appropriate site. In short I can't use my DVD player. (this is the third one I've purchased.
How much USB-3 power (I don't know what else to call it) is put out and how can I find out if I'm overloading the circuit.
MacBook Air 13″, macOS 11.6