international system of units [1]![click to hear](/images/speaker.jpg)
Decimal system established by the 11th General Conference on Weights and Measures (GCWM) in 1960 and used by many countries.
volt ![click to hear](/images/speaker.jpg)
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 ![click to hear](/images/speaker.jpg)
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 ![click to hear](/images/speaker.jpg)
Unit of light intensity equivalent to a radiant intensity of 1/683 watts per steradian (solid angle).
coulomb ![click to hear](/images/speaker.jpg)
Amount of electricity carried in 1 second by a current of 1 ampere.
joule ![click to hear](/images/speaker.jpg)
Amount of energy released by the force of 1 newton acting through a distance of 1 meter.
watt ![click to hear](/images/speaker.jpg)
Energy transfer of 1 joule during 1 second.
hertz ![click to hear](/images/speaker.jpg)
Frequency of a periodic phenomenon whose period is 1 second.
ampere ![click to hear](/images/speaker.jpg)
Constant current of 1 joule per second in a conductor.