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I know some countries use 110v dc power supply system instead of 220v ac but I don't know the reason of that.
And got the following answer:
North America uses Alternating Current from 110-120 voltage range because that is the UL specification for most devices. There is a 220vAC 3-phase configuration for appliances with induction motors, compressors and or dual high watt systems like motors and heating elements. In Actuality most customers of commercial power experience voltage variances from (Brown-Out) 90vAC -( Spike) 135vAC due to supply & demand characteristics of a specified area.