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This is just a standard that has been applied differently in different locals. much the same as cars originally were 6 volts but now the standard is12 volts. There is no intrinsic advantage other than maintaining the standard makes it easier to move electric motors from one area to another. The same vacuum cleaner works in NewYork and Denver. India has set their standard at 220 volts and this standard is maintained throughout the country.

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15y ago

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