SAM-Consult Machteld van  Meterenlaan 30 2628 LR  Delft The Netherlands Tel: +31-15-2616939 Fax: +31-15-2569303 Email: info@samconsult.biz Map of Delft	SI Derived Units
	Name Symbol Category Equivalent SI Base Units becquerel Bq radioactivity 1/s coulomb C quantity of electricity, electric charge A-s farad F electric capacitance A2-s4/kg-m2 gray Gy absorbed dose of radiation, kerma m2/s2 henry H electric inductance kg-m2/A2-s2 hertz Hz frequency 1/s joule J energy, work, heat kg-m2/s2 lumen lm luminous flux cd-sr lux lx illuminance cd-sr/m2 newton N force kg-m/s2 ohm W electric resistance kg-m2/A2-s3 pascal Pa pressure, stress kg/m-s2 poiseuille Po dynamic viscosity, absolute viscosity kg/m-s siemens S electric conductance A2-s3/kg-m2 sievert Sv dose equivalent, dose equivalent index m2/s2 tesla T magnetic field kg/A-s2 volt V electric potential, electromotive force kg-m2/A-s3 watt W power, radiant flux kg-m2/s3 weber Wb induction magnetic flux kg-m2/A-s2   farad [F] The farad is the SI unit of the capacitance of an electrical system, that is, its capacity to store electricity. It is a rather large unit as defined and is more often used as a microfarad. It is named after the English chemist and physicist Michael Faraday (1791-1867). hertz [Hz] The hertz is the SI unit of the frequency of a periodic phenomenon. One hertz indicates that 1 cycle of the phenomenon occurs every second. For most work much higher frequencies are needed such as the kilohertz [kHz] and megahertz [MHz]. It is named after the German physicist Heinrich Rudolph Hertz (1857-94). joule [J] The joule is the SI unit of work or energy. One joule is the amount of work done when an applied force of 1 newton moves through a distance of 1 metre in the direction of the force.It is named after the English physicist James Prescott Joule (1818-89). newton [N] The newton is the SI unit of force. One newton is the force required to give a mass of 1 kilogram an acceleration of 1 metre per second per second. It is named after the English mathematician and physicist Sir Isaac Newton (1642-1727). ohm [] The ohm is the SI unit of resistance of an electrical conductor. Its symbol, is the capital Greek letter 'omega'. It is named after the German physicist Georg Simon Ohm (1789-1854). pascal [Pa] The pascal is the SI unit of pressure. One pascal is the pressure generated by a force of 1 newton acting on an area of 1 square metre. It is a rather small unit as defined and is more often used as a kilopascal [kPa]. It is named after the French mathematician, physicist and philosopher Blaise Pascal (1623-62). volt [V] The volt is the SI unit of electric potential. One volt is the difference of potential between two points of an electical conductor when a current of 1 ampere flowing between those points dissipates a power of 1 watt. It is named after the Italian physicist Count Alessandro Giuseppe Anastasio Volta (1745-1827). watt [W] The watt is used to measure power or the rate of doing work. One watt is a power of 1 joule per second. It is named after the Scottish engineer James Watt (1736-1819).

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Last modified: January 15, 2009