What is root mean square root mean square and its definition?

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Its definition:

1. Sometimes called root mean square, written in English as root mean square (RMS), refers to the most common mathematical method to define the effective voltage or current of AC wave;

2. The traditional American dictionary is defined as the square root of the average of the squares of a set of numbers.

That is, the sum of squares of n terms divided by n and then squared, that is, the root mean square result.