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The unit of Current is Ampere. Abbreviation of Current is 'I' and that of Ampere is 'A'. The unit of Resistance is ohm. Abbreviation of Resistance is 'R' and that of ohm is the symbol of 'omega' or the symbol of 'ohm'.
The ampere is the SI Base Unit or electric current. It is NOT derived from the charge (coulomb) but from the force resulting from its magnetic effect. The ampere is defined in terms of the force between two, parallel, current-carrying conductors due to the interaction of their magnetic fields. The coulomb, on the other hand, is an SI Derived Unit, based on the ampere and the second.
The unit for electrical current is the ampere.
An ampere-foot is a unit used in calculating the fall of pressure in distributing electrical mains, equivalent to a current of one ampere flowing through one foot of conductor.
A volt - ampere is the unit for the product of voltage and current. This is power. Power = voltage x current. The unit of power is more usually called the watt. Volts x amps = watts.