Re: What/who defines "unfit for purpose"?


"johannes" <johs@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
news:48A8769F.ABBA1C3F@xxxxxxxxxxxxxxxxxxxxxxxxxx


"Anthony R. Gold" wrote:

On Sun, 17 Aug 2008 19:51:48 +0100, "Anthony R. Gold"
<not-for-mail@xxxxxxxxxx> wrote:

On Sun, 17 Aug 2008 19:48:36 +0100, Betty Swallocks
<redandhairy@xxxxxxxxxxx> wrote:

For kristsake. It is Joe Public who asked not Einstein! The RMS value
is
an average value of the sine wave.

The root of the mean square equals the average?

Maybe we should take a vote on that :-)

P.s. the average of a sine wave is zero :-(

RMS is the average of the absolute value of the sine wave.

Er, No it isn't. It's the square root of the mean of the squares of the
sine wave (Hence Root Mean Square or RMS). The average of the absolute
value of the UK mains is 216.2 volts.



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