On Apr 6, 6:25*pm, wrote:
On Tue, 06 Apr 2010 16:10:51 -0400, Peter wrote:
On 4/6/2010 3:37 PM, wrote:
On Tue, 6 Apr 2010 12:03:40 -0700 (PDT),
wrote:

Why do they use 50 or 60 Hz in different places? *Who determined what
they use, and why?. . . .
*What would happen if they used 30 hz, or 80? *

With an interconnected power grid, it's vital that all intersections
be PRECISELY synchronized.
By the way, one consequence of the different power frequencies in
Europe and the US was TV standards, which originally were synched to
the power lines: European TV had slightly more perceptible flicker,
due to a slower frame rate (50 fields per second to our 60), though
most Euro systems did have higher definition for reasons unrelated to
powerline frequency.