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Old 25th January 2020
Lives for gear
You can't know for sure, since power supply circuits (and even wall warts) differ. All you know is that its output is 5.7 V, 1 A... or ~6 watts.

But understand this: anything the power supply consumes that doesn't turn into the ~ 6 w needed by the circuit has to be turned into some other form of energy*. Usually that's heat, but it could also be sound or light. So unless the supply runs incredibly hot (or bright), I wouldn't expect it to draw much more than 100 mA from a 110v wall outlet.

If you want to know for sure, invest in a Kill A Watt or similar plug-in meter. They run about $25, and every studio and/or homeowner should have one.

* Or mass. E=mc^2. ; )