derived unit

A derived unit is one that is defined by simple combination of base units. There are 18 derived units in the SI system. These are listed in the table below.


Derived SI units with special names
physical quantity name of unit symbol
frequency hertz Hz
energy joule J
force newton N
power watt W
pressure pascal Pa
electric charge coulomb C
electrical resistance ohm Ω
electrical conductance siemens S
electrical capacitance farad F
magnetic flux weber Wb
inductance henry H
magnetic flux density tesla T
luminous flux lumen lm
illuminance lux lx
absorbed dose gray Gy
activity becquerel Bq
equivalent dose sievert Sv