nanog mailing list archives
Re: Why choose 120 volts?
From: Robert Bonomi <bonomi () mail r-bonomi com>
Date: Wed, 27 May 2009 20:30:49 -0500 (CDT)
Subject: Re: Why choose 120 volts? Date: Thu, 28 May 2009 01:11:41 +0200 On 27 mei 2009, at 18:03, Peter Beckman wrote:I haven't seen a PC power supply which is incapable of both 120v/ 60hz and 240v/50hz in a very long time.After this nice voltage discussion, what about hertz? Would it be more efficient for us Europeans to run our stuff at 60 Hz rather than 50? I hear that a 50 Hz grid loses 15% more due to inefficiencies than a 60 Hz grid. Not sure if that also applies over short distances, though.
_Transformer_ losses are greater at lower frequencies. And the cores have to be bigger. That is the primary reason military avionics, and other onboard gear use 400Hz AC. Note: The U.S. as recently as immediate post WW-II had some areas of 25-Hz power. Transformer based equipment that was designed to be "just adequate" for 60Hz mains was known to 'let the smoke out' when plugged in in one of those 25Hz areas.
Current thread:
- Re: Why choose 120 volts?, (continued)
- Re: Why choose 120 volts? Colin Alston (May 27)
- Re: Why choose 120 volts? Leo Bicknell (May 26)
- Re: Why choose 120 volts? Paul Vixie (May 26)
- Re: Why choose 120 volts? Ricky Beam (May 26)
- Re: Why choose 120 volts? Paul Vixie (May 26)
- Re: Why choose 120 volts? Ulf Zimmermann (May 26)
- Re: Why choose 120 volts? Luke S Crawford (May 26)
- Re: Why choose 120 volts? Barton F Bruce (May 26)
- Re: Why choose 120 volts? William Pitcock (May 28)
- Re: Why choose 120 volts? Ronald Cotoni (May 28)
- RE: Why choose 120 volts? Gregory Hicks (May 26)
- Re: Why choose 120 volts? Robert Bonomi (May 27)
- Re: Why choose 120 volts? joel jaeggli (May 28)
- Re: Why choose 120 volts? Brandon Butterworth (May 28)