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Power is RMS. Power can vary, but it's always RMS. The idea is that for sine wave AC, RMS voltage and current will dissipate the same power as the DC values for both. My digital vector RF watt meter does not magically switch to computing power from the peak RF voltage when I switch it to peak. To do would be nonsensical.When I select "average" it yields the average over some integration period; it doesn't switch to RMS.?

73,

Kim N5OP

I agree with the later part of your response, but you sort of contradicted yourself with

""Peak" on a watt meter is the peak power, which is always part of a a running-RMS (like a running mean but RMS instead) power. "

but then you said ;

"There is no such thing as "RMS power"

I guess my point is getting back to basic AC, is looking over a 360 degree cycle? with peak, valley and then a rms value to equate it to a DC constant.

I agree that power that varies over time can have max and minimum value for the time mapped.

Do you agree with Kims comment re "There’s no such thing as “RMS power”; peak power come from peak RMS values."

In the audio world ;

Root mean square or simply RMS watts refers to?continuous power handling of a speaker or a subwoofer or how much continuous power an amplifier can output. RMS values are usually lower than peak watts ratings, but they represent what a unit is truly capable of handling.

73

vk4tux

peak power come from peak RMS values

On 18/4/25 09:32, Kim Elmore via groups.io wrote:

That's simply incorrect. Our voice "peaks" are very long, compared to the RF frequency, they they have do indeed have a running RMS value. "Peak" on a watt meter is the peak power, which is always part of a a running-RMS (like a running mean but RMS instead) power.?

Your house current id 60 Hz and has a peak voltage of about 169 V. Is your light blulb or power input to you amp rated based on 120 VAC or 169 V peak AC? Yes, wire insulation must be rated for the peak voltage it is to with stand, but it's current carrying capacity is rated in the RMS current. There is no such thing as "RMS power": it's simply power, computed based on the RMS voltage, current, or the RMS voltage squared over the impedance, or the RMS current squared milipaited by the impedance.

73,

Kim N5OP