NASA-Systems Engineering

# C24 ohm va the ohm is the electric resistance between

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Unformatted text preview: onductors of infinite length, of negligible circular cross section, and placed one meter apart in vacuum, would produce -7 between these conductors a force equal to 2 x 10 newton per meter of length. candela (cd) The candela is the luminous intensity, in a given direction, of a source that emits monochromatic 12 radiation of frequency 540 x 10 Hz and that has a radiant intensity in that direction of 1/683 watt per steradian. kelvin (K) The kelvin, unit of thermodynamic temperature, is the fraction 1/273.16 of the thermodynamic temperature of the triple point of water. NASA Systems Engineering Handbook kilogram (kg) The kilogram is the unit of mass; it is equal to the mass of the international prototype of the kilogram. (The international prototype of the kilogram is a particular cylinder of platinum-iridium alloy which is preserved in a vault at Sevres, France, by the International Bureau of Weights and Measures.) meter (m) The meter is the length of the path traveled by light in a vacuum during a time interval of 1 299 792 458 of a second. mole (mol) The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon-12. Note: When the mole is used, the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles. second (s) The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. C.2.3 Supplementary SI Units difference of potential of one volt when it is charged by a quantity of electricity equal to one coulomb. gray (Gy = J/kg) The gray is the absorbed dose when the energy per unit mass imparted to matter by ionizing radiation is one joule per kilogram. (The gray is also used for the ionizing radiation quantities: specific energy imparted, kerma, and absorbed dose index.) henry (H = Wb/A) The henry is the inductan...
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## This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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