Re: [Amps] Measuring RF Power

[Gary Schafer <garyschafer@comcast.net>]

If what you say was true then there would never be any power into our 
transmission lines.

Average power is not zero simply because there is no negative power.

There is only RMS voltage and RMS current. No RMS power.

Peak voltage is 1.414 times RMS voltage. Those conversions don't work 
with power.

73
Gary  K4FMX

TexasRF@aol.com wrote:
>  
> I lost track of who said what/when;
>  In a sine wave the average voltage is zero therefore average power is  
> zero.In an ac circuit with sine wave voltage, average current is also zero. 
> One  
> could be led to think that average power is also zero?
>  
> There is an RMS value related to peak value divided by square root of 2;  
> same as peak times .707.
> There is an effective value related to equivalent d.c. value which is also  
> equal to the rms value.
>  
> See Radio Handbook Alternating Circuits, Impedance and Resonant Circuits  
> Chapter, pg 3-3 in the 23rd Edition.
>  
> Historically we have always referred to peak power as 1.414 times rms power  
> but not sure of the basis for this. Perhaps someone else knows.
>  
> 73/k5gw
> 
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> 



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