Then there was root-mean-square (RMS ... If you look up common RMS values for different waveforms, you’ll see the RMS voltage of a square wave with peak voltage V is just V.

Roots are the opposite of powers. As 2 squared is 4, then a square root of 4 must be 2. \(2^2 = 4\). Reversing this gives \(\sqrt{4} = 2\). To find square roots or cube roots, work backwards from ...