# Council Directive of 20 December 1979 on the approximation of the laws of the Member States relating to units of measurement and on the repeal of Directive 71/354/EEC (80/181/EEC), Division 1.2.3: SI derived units with special names and symbols

Extent: E+W+S+N.I.

Special names for the unit of power: the name volt–ampere (symbol ‘ VA ’ ) when it is used to express the apparent power of alternating electric current, and var (symbol ‘ var ’ ) when it is used to express reactive electric power. The ‘ var ’ is not included in GCPM resolutions.
Quantity
Unit
Expression
Name
Symbol
In terms of other SI units
In terms of SI base units
Plane angle
radian
rad
m · m –1
Solid angle
steradian
sr
m 2 · m –2
Frequency
hertz
Hz
s –1
Force
newton
N
m · kg · s –2
Pressure, stress
pascal
Pa
N · m –2
m –1 · kg · s –2
Energy, work; quantity of heat
joule
J
N · m
m 2 · kg · s –2
Power , radiant flux
watt
W
J · s –1
m 2 · kg · s –3
Quantity of electricity, electric charge
coulomb
C
s · A
Electric potential, potential difference, electromotive force
volt
V
W · A –1
m 2 · kg · s –3 · A –1
Electric resistance
ohm
Ω
V · A –1
m 2 · kg · s –3 · A –2
Conductance
siemens
S
A · V –1
m –2 · kg –1 · s 3 · A 2
Capacitance
farad
F
C · V –1
m –2 · kg –1 · s 4 · A 2
Magnetic flux
weber
Wb
V · s
m 2 · kg · s –2 · A –1
Magnetic flux density
tesla
T
Wb · m –2
kg · s –2 · A –1
Inductance
henry
H
Wb · A –1
m 2 · kg · s –2 · A –2
Luminous flux
lumen
lm
cd · sr
cd
Illuminance
lux
lx
lm · m –2
m –2 · cd
Activity (of a radionuclide)
becquerel
Bq
s –1
Absorbed dose, specific energy imparted, kerma, absorbed dose index
gray
Gy
J · kg –1
m 2 · s –2
Dose equivalent
sievert
Sv
J · kg –1
m 2 · s –2
Catalytic activity
katal
kat
mol · s –1
Units derived from SI base units may be expressed in terms of the units listed in Chapter I.
In particular, derived SI units may be expressed by the special names and symbols given in the above table; for example, the SI unit of dynamic viscosity may be expressed as m –1 · kg · s –1 or N · s · m –2 or Pa · s.

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Source: https://www.legislation.gov.uk/eudr/1980/181/annex/chapter/I/division/1/division/1.2/division/1.2.3 (the official version)
Page: https://openlegislation.uk/eu-directive-1980-181/annex/chapter-I/division-1/division-1.2/division-1.2.3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.