Power, root-power | root power
FromWikipedia,thefreeencyclopediaApowerquantityisapoweroraquantitydirectlyproportionaltopower,e.g.,energydensity,acousticintensity,andluminousintensity.[1]Energyquantitiesmayalsobelabelledaspowerquantitiesinthiscontext.[2]Aroot-powerquantityisaquantitysuchasvoltage,current,soundpressure,electricfieldstrength,speed,orchargedensity,thesquareofwhich,inlinearsystems,isproportionaltopower.[3]Thetermroot-powerquantityreferstothesquarerootthatrelatesthesequantitiestopower.ThetermwasintroducedinISO8...
From Wikipedia, the free encyclopedia
A power quantity is a power or a quantity directly proportional to power, e.g., energy density, acoustic intensity, and luminous intensity.[1] Energy quantities may also be labelled as power quantities in this context.[2]
A root-power quantity is a quantity such as voltage, current, sound pressure, electric field strength, speed, or charge density, the square of which, in linear systems, is proportional to power.[3] The term root-power quantity refers to the square root that relates these quantities to power. The term was introduced in ISO 80000-1 § Annex C; it replaces and deprecates the term field quantity.
Implications[edit]It is essential to know which category a measurement belongs to when using decibels (dB) for comparing the levels of such quantities. A change of one bel in the level corresponds to a 10× change in power, so when comparing power quantities x and y, the difference is defined to ...