international system of units [1]

Decimal system established by the 11th General Conference on Weights and Measures (GCWM) in 1960 and used by many countries.

volt

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.

ohm

Electrical resistance between two points of a conductor carrying a current of 1 ampere when the difference in potential between them is 1 volt.

candela

Unit of light intensity equivalent to a radiant intensity of 1/683 watts per steradian (solid angle).

coulomb

Amount of electricity carried in 1 second by a current of 1 ampere.

joule

Amount of energy released by the force of 1 newton acting through a distance of 1 meter.

watt

Energy transfer of 1 joule during 1 second.

hertz

Frequency of a periodic phenomenon whose period is 1 second.

ampere

Constant current of 1 joule per second in a conductor.