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Unformatted text preview: place of the kelvin for
expressing Celsius temperature defined by the equation
t= T T0, where t is the Celsius temperature, T is the
thermodynamic temperature, and To = 273.15 K (by
definition).
. coulomb (C = A s) Electric charge is the time integral of
electric current; its unit, the coulomb, is equal to one
ampere second.
farad (F = C/V ) The farad is the capacitance of a
capacitor between the plates of which there appears a pascal (Pa = N/m 2) The pascal [which, in the preferred
pronunciation, rhymes with rascal] is the pressure or
stress of one newton per square meter. NASA Systems Engineering Handbook
siemens (S = A/V ) The siemens is the electric conductance of a conductor in which a current of one ampere is
produced by an electric potential difference of one volt. degree (°) 1°= (π/ 180) red
minute (') 1' = (1/60)° = (π/10 800) rad
second (") 1 " = (1/60)' = (π/648 000) rad sievert (Sv = J/kg) The sievert is the dose equivalent
when the absorbed dose of ionizing radiation multiplied
by the dimensionless factors Q (quality factor) and N
(product of any other multiplying factors) stipulated by
the International Commission on Radiological Protection
is one joule per kilogram. Area The SI unit of area is the square meter (m2). The
hectare (ha) is a special name for the square
hectometer (hm2). Large land or water areas are
generally expressed in hectares or in square kilometers
(km2). tesla (T = Wb/m 2) The tesla is the magnetic flux density
of one weber per square meter. In an alternative
approach to defining the magnetic field quantities the
tesla may also be defined as the magnetic flux density
that produces on a onemeter length of wire carrying a
current of one ampere, oriented normal to the flux
density, a force of one newton, magnetic flux density
being defined as an axial vector quantity such that the
force exerted on an element of current is equal to the
vector product of this element and the magnetic flux
density.
volt (V = W/A) The volt (unit of electric potential...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.
 Spring '13
 Mr.Kau
 Systems Engineering, The American, ... ...

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