power

1. At a point in a system, circuit, or component, the rate of transfer or absorption of energy per unit time. Note 1: Power usually is expressed in watts. A modifier may be used, such as power_electrical, power_optical, or power_sound.Note 2: Whenever the power of a transmitted electromagnetic wave is indicated, an appropriate modifier should be used, such as peak envelope power, average power, mean power, instantaneous power, root-mean-square (rms) power, effective power, or carrier power. 2. In the transmission of an electromagnetic wave, the rate of transfer of energy expressed in a form according to the class of emission, such as (a) peak envelope power (PX or pX), (b) mean power (PY or pY), or (c) carrier power (PZ or pZ). Note 1:For different classes of emission, the relationships between peak envelope power, mean power, and carrier power, under the conditions of normal operation and no modulation, are contained in International Radio Consultative Committee (CCIR) Recommendations...