http://interestingengineering.com/why-the-usa-uses-110v-60-hz-ac-and-other-countries-dont/
This article tells the mainline history of different voltages and frequencies. There were also other frequencies and voltages used on some areas.
http://interestingengineering.com/why-the-usa-uses-110v-60-hz-ac-and-other-countries-dont/
This article tells the mainline history of different voltages and frequencies. There were also other frequencies and voltages used on some areas.
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