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Power level may refer to: . Level (logarithmic quantity), logarithm of the ratio of the value of some quantity to a reference value of the same quantity. Sound power level; The act of power-leveling in video games.
The level of a root-power quantity (also known as a field quantity), denoted L F, is defined by [5] = = = . where F is the root-power quantity, proportional to the square root of power quantity;
In general the relationship between the power level P in dBm and the RMS voltage V in volts across a load of resistance R (typically used to terminate a transmission line with impedance Z) is: = /. Expression in dBm is typically used for optical and electrical power measurements, not for other types of power (such as thermal).
Some beings are capable of sensing the Power Level or Battle Power (戦闘力, Sentō-ryoku) of others, denoting their strength as a combatant. Aliens serving the galactic tyrant Frieza possess "scouters," devices that duplicate this ability technologically and can quantify different combatants' power levels objectively, though warriors can ...
A graph of the A-, B-, C- and D-weightings across the frequency range 10 Hz – 20 kHz Video illustrating A-weighting by analyzing a sine sweep (contains audio). A-weighting is a form of frequency weighting and the most commonly used of a family of curves defined in the International standard IEC 61672:2003 and various national standards relating to the measurement of sound pressure level. [1]
One definition of signal-to-noise ratio is the ratio of the power of a signal (meaningful input) to the power of background noise (meaningless or unwanted input): =, where P is average power.
Sound power or acoustic power is the rate at which sound energy is emitted, reflected, transmitted or received, per unit time. [1] It is defined [2] as "through a surface, the product of the sound pressure, and the component of the particle velocity, at a point on the surface in the direction normal to the surface, integrated over that surface."
where P 1 is the optical power level generated when the light source is on, and P 0 is the power level generated when the light source is off. The polarization extinction ratio (PER) is the ratio of optical powers of perpendicular polarizations, usually called TE (transverse electric) and TM (transverse magnetic). In telecommunications, the PER ...