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    Robert Gift's Avatar
    Robert Gift Posts: 100, Reputation: 3
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    #1

    Apr 17, 2010, 11:38 PM
    Why is USA 60 Hz and China, UK, Europe 50 Hz?
    Does 50 Hz transmit over longer distances better than 60 Hz and electrical systems developed later make use of that knowledge?

    Thank you,

    Robert
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Apr 18, 2010, 12:18 AM

    http://en.wikipedia.org/wiki/Utility_frequency
    Robert Gift's Avatar
    Robert Gift Posts: 100, Reputation: 3
    Junior Member
    		  
    #3

    Apr 18, 2010, 03:01 AM
    Thanks, KISS.
    Unfortunately "... with no technical reason to prefer one over the other.. .
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #4

    Apr 18, 2010, 03:32 AM

    Well, the higher the frequency the lower the amount of iron. That's why aircraft systems are 400 Hz.

    Frequency generators were largely mechanical. Think the old vibrators for car radios. Basically a vibrating relay.

    I wouldn't be surprised that the metric system that something to do with it. Note that NTSC WAS based on exactly 60 Hz and I believe e the PAL standard is based on 50 Hz.

    Japan has a 100 VAC system is some parts.
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