Effective power

The effective power is equal to the product of the effective current and the effective Stress ( $U_ {EFF} *I_ {EFF}$ ).

Electrokinetic

Into elecrocinetic the effective power is the median value of the power: $P = {1 \ over T} \ int_0^T {p (T) dt}$ , if $U (T) = U \ sqrt {2} \ cos {wt}$ and $I (T) = I \ sqrt {2} \ cos {(wt+ \ phi)}$ then one shows while integrating that $P = UI \ cos {(\ phi)} \,$ , $\ phi \,$ are dephasing between the tension and the current, $\ cos {\ phi} \,$ is called power-factor.

Audio

RMS means Root Mean Square in English (root of the average of the square of the tension). In acoustics, the effective power indicates the quadratic average of the instantaneous power (in Watts RMS). It is often said that it is the really significant power. In fact, only the average power of order 1 (the simple average, and not the quadratic average) has a physical significance.

In sinusoidal Mode, the effective power is equal to the amplitude of the instantaneous power, divided by the square root of 2. This result is found by integrating a square sine over one period.

Attention should be paid not to confuse the acoustic definition of effective power with the electrokinetic definition, where the effective power indicates the simple average of the instantaneous power. In this last case, the effective power is equal to half of the amplitude of the instantaneous power.

See too

Median values: Average

Effective values: effective Value

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