ac & dc

Discussion in 'General Electronics Chat' started by swty_todd, Feb 28, 2009.

  1. swty_todd

    Thread Starter Active Member

    Aug 3, 2008
    82
    0
    while travelling in the electric locals(trains) that we have our here, i read a signboard said "do not travel on rooftops because the lines above have 25000v AC or 1500 DC"
    i was wondering how electricity could be both AC and DC.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    The sign states that it is an either/or situation. The locomotive has rectifiers to make the AC into DC, so the motors don't care.
     
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