You did not say what country you are in! Most of the answers assume USA, but in much of the rest of the world we use higher voltages, so much less current is drawn for the same power. My supply is nominally 240-V RMS, though it is usually 250. Outlets are rated for 10-Amps, with 15-Amps for bigger loads like running a caravan!
Someone mentioned phases, in the context of stages of rewiring. In Alternating Current (AC) mains electrical supply, there are usually three phases using three wires running down a street. Each phase is an AC sinewave rotated 120-degrees from its neighbours. Often, each house just gets one phase. When the lights are out in every third house, you know one phase has gone down!
For high power devices (like my sauna and big bench sander) we have the option of using all three phases (3 wires plus earth) for three times the power. The average power delivered through three phases is very smooth - none of the stops and starts and reverses you get with single phase AC.
Oddly, I have never come across audiophile power supplies designed for 3-phase.
Another difference is that we use 50-Hz, not 60!