Fundamental Units

Quantity

Name of unit

Abbreviation

Length
meter
m
Mass
kilogram
kg
Time
second
s
Electrical Current
ampere
A
Temperature
kelvin
K


Derived Units

Quantity

Name of unit

Symbol

SI Units

Force
newton
N

kg m s-2

Pressure
pascal
Pa

N m-2 = kg m-1 s-2
Energy
joule
J

kg m2 s-2

Power
watt
W

J s-1 = kg m2 s-3

Electrical Potential Difference

volt
V

W A-1 = kg m2 s-3 A-1

Electrical Charge

coulomb
C

A s

Electrical Resistance

ohm
W

V A-1 = kg m2 s-3 A-2

Electrical Capacitance

farad
F

A s V-1 = kg-1 m-2 s4 A2

Frequency
hertz
Hz

s-1

Sound Level
decibel
dB

10 log (p1/p2)

Celsius Temperature

degree
°C

K - 273.15

Temperature Interval

degree

deg or °

either K or °C