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The mean AC power provides the same heating as DC. So RMS watts have no practical use, but that doesn’t stop them being used in the wrong places.?

For a sine wave feeding a resistor, the mean power dissipated in the resistor is not the same as the RMS power. I did once work out the maths of it, but can’t recall the difference - if you Google RMS power, I am sure you will find articles showing ?RMS power is a pointless measurement.?

But as I note from both Analog Devices and Minicircuits, even big companies make the error occasionally.? Keysight seem immune - I can’t see any Keysight products that claim to measure RMS power.?? But I have seen the term on some bit of test equipment. I thought it was old HP, but it might have been Marconi.?