international system of units 
Decimal system established by the 11th General Conference on Weights and Measures (GCWM) in 1960 and used by many countries.
Difference in potential between two points of a conductor carrying a constant current of 1 ampere when the power between these points is 1 watt.
Electrical resistance between two points of a conductor carrying a current of 1 ampere when the difference in potential between them is 1 volt.
Unit of light intensity equivalent to a radiant intensity of 1/683 watts per steradian (solid angle).
Amount of electricity carried in 1 second by a current of 1 ampere.
Amount of energy released by the force of 1 newton acting through a distance of 1 meter.
Energy transfer of 1 joule during 1 second.
Frequency of a periodic phenomenon whose period is 1 second.
Constant current of 1 joule per second in a conductor.