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Old 25th January 2020
  #2
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.

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