Международна система за мерки - СИ

SUPPLEMENTARY UNITS

Unit of plane angle : radian ( rad)
The radian is the plane angle formed by two radius which cut an arc of circle having the same length of the radius.

Unit of solid angle : steradian (sr)
The steradian is the solid angle, with the vertex at the centre of a sphere, which defines an area equal to the square of the radius on the surface of the sphere.

Physical quantity	Units		Expression
Physical quantity	Name	Symbol	In other SI units	In SI basic units
Frequency	hertz	Hz		s^-1
Force	newton	N		m·kg·s^-2
Pressure and tension	pascal	Pa	N·m²	m^-1·kg·s^-2
Energy, work, heat quantity	joule	J	N·m	m²·kg·s^-2
Power (mechanical, thermal, electric)	watt	W	J·s^-1	m²·kg·s^-3
Quantity of electricity, electric charge	coulomb	C		A·s
Voltage, electric potential	volt	V	W·A^-1	m²·kg·s^-3·A^-1
Electric resistance	ohm	Ω	V·A^-1	m²·kg·s^-3·A^-2
Electric conductance	Siemens	S	A·V^-1	m^-2·kg^-1·s³·A²
Electric capacitance	farad	F	C·V^-1	m²·kg^-1·s⁴·A²
Magnetic flux	weber	Wb	V·s	m²·kg·s^-2·A^-1
Magnetic induction	tesla	T	Wb·m^-2	kg·s^-2·A^-1
Electric inductance	henry	H	Wb·A^-1	m²·kg·s^-2·A^-2
Luminous flux	lumen	lm		cd·sr
Illumination	lux	lx	lm·m²	cd·sr·m^-2
Activity	becquerel	Bq		s^-1
Absorbed dose	gray	Gy	J·kg^-1	m²·s^-2