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Some Basics

The Micrometer:

imgReading:


Vernier Calipers:


SI Base Units

Physical QuantityUnit  
NameSymbolNameSymbol
massmkilogramkg
lengthxmetrem
timetseconds
electric currentIampereA
temperature intervalΔTkelvinK
amount of substancenmolemol
luminous intensityIcandelacd

SI comes from the French Le Système International d’Unités’

Symbol cases are significant (e.g. t = time; T = temperature)


Derived Units

*Quantity**Symbol (s)Unit
areaA
volumeV
densityD or ρ
velocityu or v
momentump
accelerationa
forceF
workW

Derived units and their conversion to Base units

Physical quantitysymbol (s)namesymbolbase SI form
forceFnewtonN
work & energyW & EjouleJ
powerPwattW
pressureppascalPa
electric chargeq or QcoulombC
p.d. (voltage)VvoltV
resistanceRohmΩ
frequencyfhertzHz

Prefixes and scale:


multipleprefixsymbolexample
kilokkm
megaMMW
gigaGGHz
teraTTb
petaPPm
exaEEHz
multipleprefixsymbolexample
/ 10deciddB
/ 100centiccm
/ 1000millimmA
/ 1000 000micro
nanonnC
picoppF
femtoffm
attoaas

 

 

@JRowing

 

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