120mm Fan?

[Nick2bad4u]

Quick question, how many watts would a led 120mm fan use? and how many watts would 1 usb port use? Kk thanks

[Kasm]

Fans can use up to roughly 10 watts though many run on less. A usb port is limited to .500 mA at 5 Volts, so that is 2.5 watts.

[nd4spdbh2]

1 usb port can output 5v @ .5a so 2.5w ... a yate loon 120mm blue led fan uses 12v .3a so 3.6w