SI Units - The Ampere 
This is the fourth of our introductory courses on the SI units. This course is an introduction to the unit of electric current, the
Ampere, and its derived units. The course outline is as follows:
Introduction
The
Definition of the Ampere
Realization of the Ampere
Derived
Units
Charge (the
Coulomb)
Potential (the
Volt)
Resistance
more...