root-mean-square value
41Square root of 5 — The square root of 5 is the positive real number that, when multiplied by itself, gives the prime number 5. This number appears in the formula for the golden ratio. It can be denoted in surd form as::sqrt{5}.It is an irrational algebraic number.… …
42Square (algebra) — In algebra, the square of a number is that number multiplied by itself. To square a quantity is to multiply it by itself.Its notation is a superscripted 2 ; a number x squared is written as x ². Thus: If x is a positive real number, the value of… …
43mean, median, and mode — In mathematics, the three principal ways of designating the average value of a list of numbers. The arithmetic mean is found by adding the numbers and dividing the sum by the number of numbers in the list. This is what is most often meant by an… …
44Methods of computing square roots — There are several methods for calculating the principal square root of a nonnegative real number. For the square roots of a negative or complex number, see below. Contents 1 Rough estimation 2 Babylonian method 2.1 Example …
45Face of a square — Face Face (f[=a]s), n. [F., from L. facies form, shape, face, perh. from facere to make (see {Fact}); or perh. orig. meaning appearance, and from a root meaning to shine, and akin to E. fancy. Cf. {Facetious}.] 1. The exterior form or appearance… …
46face value — Face Face (f[=a]s), n. [F., from L. facies form, shape, face, perh. from facere to make (see {Fact}); or perh. orig. meaning appearance, and from a root meaning to shine, and akin to E. fancy. Cf. {Facetious}.] 1. The exterior form or appearance… …
47face value — Face Face (f[=a]s), n. [F., from L. facies form, shape, face, perh. from facere to make (see {Fact}); or perh. orig. meaning appearance, and from a root meaning to shine, and akin to E. fancy. Cf. {Facetious}.] 1. The exterior form or appearance… …
48Alternating current — (green curve). The horizontal axis measures time; the vertical, current or voltage. In alternating current (AC, also ac) the movement of electric charge periodically reverses direction. In direct current (DC, also dc), the flow of electric charge …
49Johnson–Nyquist noise — (thermal noise, Johnson noise, or Nyquist noise) is the electronic noise generated by the thermal agitation of the charge carriers (usually the electrons) inside an electrical conductor at equilibrium, which happens regardless of any applied… …
50Geometric mean — The geometric mean, in mathematics, is a type of mean or average, which indicates the central tendency or typical value of a set of numbers. It is similar to the arithmetic mean, which is what most people think of with the word average, except… …
