Derived SI units

physical entity SI unit name
SI unit symbol
In terms of the basic SI units

frequency

hertz

Hz

s-1

 

force

newton

N

Kg · m · s-2

 

pressure, mechanical stress

pascal

Pa

N · m-2

= Kg · m-1 · s-1

energy, work, heat

joule

J

N · m

= Kg · m2 · s-2

effect, radiation flux

watt

W

J · s-1

= Kg · m2 · s-3

electric charge

coulomb

C

A · s

 

electrical current, electrical potential, electromotive force

volt

V

J · C-1

= m2 · Kg · s3 · A-1

electrical resistance

ohm

Ω

V · A-1

= m2 · Kg · s3 · A-2

electrical conductance

siemens

S

A · V-1

=s3 · A2 · m-2 · Kg-1

electrical capacitance

farad

F

C · V-1

=s4 · A2 · m-2 · Kg

magnetic flux density (B-field), magnetic induction

tesla

T

V · s · m-2

= Kg · s-2 · A-1

magnetic flux

weber

Wb

V · s

= m2 · Kg · s-2 · A-1

inductance

henry

H

Vs · A-1

= m2 · Kg · s-2 · A-2

temperature

grader Celsius

°C

K

 

angle

radian

rad

1

= m · m-1

space angle

steradian

sr

1

= m2 · m-2

luminous flux, light flux

lumen

lm

cd · sr

= cd

luminance, illumination

lux

lx

cd · sr · m-2

 

activity (radioactive)

becquerel

Bq

s-1

 

absorbed dose (of radiation)

gray

Gy

J · Kg-1

= m2 · s-2

dose equivalent

sievert

Sv

J · Kg-1

= m2 · s-2

catalytic activity

katal

kat

mol · s-1

 

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