about how many milliwatts does a common usb port push,
like thru a usb wifi adaptor?

 

You can find out a lot of infromation on the USB 2.0 spec at www.usb.org.

It looks as though 2.5 watts is about the max.

hgmjr

 

100mA at 5V normally with standard descriptor. Up to 500mA max. at 5V available with successful negotiation only. So that's 0.5W and 2.5W respectively like hgmjr posted above.

 

if you ad a 1 watt amp to either one, would it be more powerful or not
because it is already over 1 watt...??? thanks