[Amps] rms Volts, Amps and Watts

[Carl]

I also agree.

RMS Watts is in the same silly season class as Sears and some others "Peak 
Horsepower" rating of electrical motors.

Carl
KM1H


----- Original Message ----- 
From: "Paul Christensen" <w9ac at arrl.net>
To: <amps at contesting.com>
Sent: Saturday, March 09, 2013 5:37 PM
Subject: Re: [Amps] rms Volts, Amps and Watts


>> rms voltage x rms current does not give rms power. It gives mean or 
>> average power. rms power can be calculated but has no useful value.
>
> An insightful perspective on "RMS Power" can be found here:
>
> http://www.eznec.com/Amateur/RMS_Power.pdf
>
> As Steve notes, it's a meaningless term that through the years, became an 
> abused adjunct for the multiplication of RMS voltage and RMS current.  In 
> 1974, the U.S. Federal Trade Commission required manufacturers of stereo 
> audio amplifiers to state power in terms of  "continuous watts."  Even so, 
> only a few did after the new regulation went into effect.
>
> Most of us probably remember some of the absurd power claims made mostly 
> by importers of Asian stereo equipment.  Back in the early '70s, our own 
> household had a "200-watt" stereo system that if measured today probably 
> could not produce 5 clean watts of power per channel.
>
> Between 1974 and now, a lot has changed with the advent of multi-channel 
> sound systems designed for home entertainment.  For those interested, the 
> most recent regulatory update occurred back in 2010 and can be found in 
> the link below.
>
> http://www.ftc.gov/os/2010/01/P974222amplifierrule.pdf
>
> Paul, W9AC
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