root mean square

root mean square

A value used to measure the heating effect of sine-wave alternating current. The rms value is found by dividing one alternation of the AC into an infinite number of instantaneous values. Each instantaneous value is squared (multiplied by itself), and all of the squares are averaged to find the average, or mean, square. The square root is taken of this mean square.

The rms value of sine wave alternating current is 0.707 time the peak value of one alternation. One ampere rms has a peak value of 1.414 ( ) amps and produces the same amount of heat as one amp of direct current. The rms value is also called the effective value. Roots-type air compressor. A positive-displacement air pump that uses two intermeshing figure-8-shaped rotors to move the air.

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