From: user5857@newsgrouper.org.invalid   
      
   BGB  posted:   
   --------------------snip----------------------------------   
   > Higher voltage would be needed with DC vs AC, as DC is more subject to   
   > resistive losses. Though, more efficiency on the AC side would be   
   > possible by increasing line frequency, say, using 240Hz rather than   
   > 60Hz; but don't want to push the frequency too high as then the wires   
   > would start working like antennas and radiating the power into space.   
      
   The military routinely uses 400 Hz to reduce the weight of transformers.   
      
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