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 |
