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General Information 9<br />
SI Derived units<br />
celsius ºC K temperature<br />
coulomb C As electric charge<br />
farad F C/V electric capacitance<br />
henry H W/A inductance<br />
hertz Hz c/s frequency<br />
joule J Ws energy<br />
lumen lm cd.sr luminous flux<br />
lux lx lm/m 2 illuminance<br />
newton N kg/m/s 2 force<br />
ohm Ω V/A electric resistance<br />
pascal Pa N/m 2 pressure<br />
siemens S 1/Ω electric conductance<br />
tesla T Wb/m 2 magnetic flux density<br />
volt V W/A electric potential<br />
watt W J/s power<br />
weber Wb Vs magnetic flux<br />
SI Supplementary units<br />
radian rad unit of plane angle equal to an angle at the<br />
centre of a circle, the arc of which is equal<br />
in length to the radius<br />
steradian sr unit of solid angle equal to an angle at the<br />
centre of a sphere subtended by a part of<br />
the surface equal in area to the square of<br />
the radius<br />
CH001.indd 9<br />
2/29/08 12:18:17 PM
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