1. Physical quantities and units.pdf

IAS Course Notes: PHYSICS 1. Physical quantities and units DIPONT Educational Resource - Science 1 1. Physical Quantities and Units_______________ Content 1.1 Physical quantities [AS] 1.2 SI Units [AS] 1.3 The Avogadro constant [A2] 1.4 Scalars and vectors [AS] Learning outcomes_____________________________________ Candidates should be able to: (a) show an understanding that all physical quantities consist of a numerical magnitude and a unit Physical Quantity 25 ms-2 Numerical magnitude Unit From the syllabus... IAS Course Notes: PHYSICS 1. Physical quantities and units DIPONT Educational Resource - Science 2 IAS Course Notes: PHYSICS 1. Physical quantities and units DIPONT Educational Resource - Science 3 IAS Course Notes: PHYSICS 1. Physical quantities and units DIPONT Educational Resource - Science 4 (b) recall the following SI base quantities and their units: mass (kg), length (m), time (s), current (A), temperature (K), amount of substance (mol) Base Quantity Unit Symbol length meter m mass kilogram kg time second s electric current ampere A temperature kelvin K amount of substance mole mol (c) express derived units as products or quotients of the SI base units and use the named units listed in this syllabus as appropriate Example of derived units s-1-Bqbecquerelactivity (of a radionuclide) m2·m-4·cd = m-2·cdlm/m2lxluxilluminance m2·m-2·cd = cdcd·sr (c)lmlumenluminous flux K-° Cdegree CelsiusCelsius temperature m2·kg·s-2·A-2Wb/AHhenryinductance kg·s-2·A-1Wb/m2Tteslamagnetic flux density m2·kg·s-2·A-1V·sWbwebermagnetic flux m-2·kg-1·s3·A2A/VSsiemenselectric conductance m2·kg·s-3·A-2V/Aohmelectric resistance m-2·kg-1·s4·A2C/VFfaradcapacitance m2·kg·s-3·A-1W/AVvoltelectric potential difference,electromotive force s·A-Ccoulombelectric charge, quantity of electricity m2·kg·s-3J/sWwattpower, radiant flux m2·kg·s-2N·mJjouleenergy, work, quantity of heat m-1·kg·