Definition:The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 x 10−19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ΔνCs. (The International Bureau of Weights and Measures)
1900,Journal of the Franklin Institute, volume149, page461:
If the volt,ampere and ohm were taken as the absolute units, the practical units would be theampere, begohm and begavolt, names just as convenient asampere, coulomb and farad.