Here's why:

* Fundamental quantities are the basic building blocks of measurement. They are defined independently and cannot be expressed in terms of other quantities. Examples include length, mass, time, and temperature.

* Derived quantities are defined using combinations of fundamental quantities.

Electric current is defined as the rate of flow of electric charge. This means it's derived from the fundamental quantity of electric charge (measured in coulombs) and time (measured in seconds).

Specifically, the formula for electric current is:

* I = Q / t

Where:

* I is the electric current (measured in amperes)

* Q is the electric charge (measured in coulombs)

* t is the time (measured in seconds)