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Old 10th February 2020
  #3
Here's how to do this:

1 Amp x 5.7 V = 5.7 Watts

5.7 Watts / 110 V = 0.0518 Amps

So, at the 110V level, it will draw an additional 0.05 (or 1/20 of an amp) if you exclude the power that is wasted as heat by the wall wart, which should be neglible.

I wouldn't sweat it too much, just plug it in, you'll be fine.