Roymech engineering encyclopedia

Derived SI Units



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Derived S.I.Units

Physical quantity Name Symbol Derivation
force newton N (kg m) / s2
power watt W ( kg m2 ) / s3
energy joule J ( kg m2 ) / s2
pressure pascal Pa kg / (m s2 )
electric charge coulomb C A s
electric potential difference volt V ( kg m2 ) / (A s3)
electric resistance ohm W ( kg m2 ) / (A2 s3)
electric conductance siemens S ( A2 s3 ) / (kg m2)
electric capacitance farad F ( A2 s4) / (kg m2)
magnetic flux weber Wb ( kg m2 ) / (A s2)
inductance henry H ( kg m2 ) / ( A2 s2)
magnetic flux density (magnetic induction) tesla T kg / (A s2)
luminous flux lumen lm cd sr
illuminance lux lx ( cd sr ) /m2
absorbed dose gray Gy m2 / s2
activity becquerel Bq 1 / s
dose equivalent sievert Sv m2 / s2
acceralation - - m / s2
angular Velocity - - rad/s
area - - m2
current density - - A / m2
density - - kg / m3
dynamic viscosity pascal second - Pa s
electric charge density coulomb/ metre2 - C / m2
electric field strength volt /metre - V / m
energy density joule / metre3 - J / m3
heat capacity joule / kelvin - J / K
heat flux density watt /metre2 - W / m2
kinematic viscosity metre2 / s - m2 / s
luminance candela /metre2 - cd / m2
magnetic field strength ampere /metre - A / m