Get your writing right – Part 2 – Derived Units

Part 2 – Derived units

In addition to the SI base units there are a number of units that are derived from these. They are obtained by appropriate combination of these basic units. For convenience, these derived units are given special names and some of those that you may meet are listed below.


Table 2 Some SI derived units

Physical quantity Units Name Symbol
Rate of activity of radioactive source s-1 becquerel Bq
Electric charge A s coulomb C
Frequency s -1 hertz Hz
Energy or work N m joule J
Force kg m s-2 newton N
Pressure N m-2 pascal Pa
Potential difference J C-1 volt V
Power J s-1 watt W