Editing Root mean square (section)

===In waveform combinations===
Waveforms made by summing known simple waveforms have an RMS value that is the root of the sum of squares of the component RMS values, if the component waveforms are [[orthogonal functions|orthogonal]] (that is, if the average of the product of one simple waveform with another is zero for all pairs other than a waveform times itself).<ref>
{{cite web
| last1=Nastase |first1=Adrian S.
| title=How to Derive the RMS Value of Pulse and Square Waveforms
| url=https://masteringelectronicsdesign.com/how-to-derive-the-rms-value-of-pulse-and-square-waveforms/
| website=MasteringElectronicsDesign.com
| access-date=21 January 2015
}}</ref>
:<math>\text{RMS}_\text{Total} =\sqrt{\text{RMS}_1^2 + \text{RMS}_2^2 + \cdots + \text{RMS}_n^2}</math>

Alternatively, for waveforms that are perfectly positively correlated, or "in phase" with each other, their RMS values sum directly.