Then there was root-mean-square (RMS) voltage. For those nice sine waves, you took the peak voltage and divided by the square root of two, 1.414 or so. You know that kid in the front of the class?

To find the cube root of a number, we have to find out which number ... Notice this is different to the square root symbol because there is a small subscript 3 in front of the \(\sqrt{}\).