"AlexW" wrote in message
...
Bob Mannix wrote:
"AlexW" wrote in message
...

Bob Eager wrote:

On Wed, 5 Oct 2005 08:53:23 UTC, "blackboab"
wrote:



AC current changes direction 50 times a second


No, it doesn't.


I thought it did actually as Electrons flow from -ve to +ve IIRC, or the
current flows from +ve to -ve in conventional notation.

The live is always energised though with either a +ve or -ve potential
wrt the neutral.


You fell into his little trap! It changes direction 100 times per second,
having a burst in both directions 50 times a second.



Trap?

It still changes 50 times second though for the UK supply, the limits
would be a minimum of 99 to 101 times.

So that would be 100, not 50

AC current could actually change at any frequency.

Well so it could but it *could* also be a 330,000 V AC supply, in which case
I wouldn't touch the neutral!
The context of the question implied a UK domestic supply of 24V 50Hz, where
the current changes direction 100 times per second and the neutral isn't
that dangerous.


--
Bob Mannix
(anti-spam is as easy as 1-2-3 - not)