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Various USB devices and their current draw

Device Idle Max Comments
Basic USB keyboard 5mA 45mA Leds (caps, num, scroll) add most current!
Optical mouse 17.3mA 32mA Logitech M-BZ96C
Argent Data OpenTrackerUSB 23mA 23mA
Edimax EW-7811Un WiFi 34mA 85mA idle at 34mA with short bursts of 71mA
2.5" Sata HDD in USB enclosure 180mA 600mA
Raspberry Pi (model A) 160mA 191mA Without Ethernet controller and 1 USB port
Raspberry Pi (model B) 404mA 367mA With Ethernet controller and 2 USB ports