20:27, mercoledì 2 luglio 2008, Paul:
> On 1 Jul, 10:30, The Wanderer <wande...@[EMAIL PROTECTED]
> wrote:
>> On Tue, 01 Jul 2008 00:14:05 +0200, ADPUF wrote:
>> > 22:53, lunedì 30 giugno 2008, John Briggs:
>> >> minimus wrote:
>> >>> Which one is correct?
>>
>> >>> Alternate between three things
>>
>> >>> Alternate among three things
>>
>> >> Neither: alternate between two things.
>>
>> > Suppose you have a three phase electric power system: you
>> > can alternate each one of the three phases to connect a
>> > mono-phase load every day to a different one of them.
>>
>> I don't think so, unless you're from the other side of the
>> pond.
>
> I tried to read a bit about the three-phased electrical power
> distribution system, but never came across the usage,
> 'alternate between three phases'. It is true you can tap power
> from any one of the three phases to pair with the neutor for
> domstic power consumption. Could you please re****t which,
> reasonably authentic source, has used this coinage?
No, I cannot quote anything.
I was only trying to make an example of alternation among more
than two chices.
Let me try again: if a pipe smoker has three pipes, that smoker
can alternate among them.
> (The quote below is not im****tant and meant only for the
> technologically inclined, among us.)
>
> Three-phase electric power is a common method of electric
> power transmission.[1] It is a type of polyphase system mainly
> used to power motors and many other devices. A three-phase
> system uses less conductor material to transmit electric power
> than equivalent single-phase, two-phase, or direct-current
> systems at the same voltage.
>
> "In a three-phase system, three circuit conductors carry three
> alternating currents (of the same frequency) which reach their
> instantaneous peak values at different times. Taking one
> conductor as the reference, the other two currents are delayed
> in time by one-third and two-thirds of one cycle of the
> electrical current. This delay between "phases" has the effect
> of giving constant power transfer over each cycle of the
> current, and also makes it possible to produce a rotating
> magnetic field in an electric motor."
--
°¿°
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