electro-Physics: 17.3409 volts

From: gordonjcp_at_gjcp.net <(gordonjcp_at_gjcp.net)>
Date: Mon Dec 13 10:47:31 2004

> I don't actually know where 50 and 60 Hz came from, nor 100 and 115
> and 220 and 240 volts. There may be some ancient justification in the
> tinkerings of various 19th century engineers, but it seems to me it
> makes most sense simply to view them as random numbers.
> paul

With a simple two-pole machine, 50Hz is acheived at 1,500rpm which is a
nice round(-ish) number. Obviously a six-pole machine will produce a 50Hz
three-phase supply at the same speed, and 60Hz at 1,800rpm.

Now, 1,500rpm is quite a good speed for steam engines and the like, and
it's possible to make direct-drive hydroelectric turbines that run at that
speed, very efficiently.

Received on Mon Dec 13 2004 - 10:47:31 GMT

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