\begin{definition}[Definition:Electric Current]
'''Electric current''' is the physical process caused by the flow of electrically charged particles, usually electrons.
Thus it is defined as the rate of flow of electric charge:
:$I = \dfrac {\d Q} {\d t}$
It is often treated as a scalar quantity, but more properly it is a vector quantity whose direction is that in which the electrically charged particles are traveling.
\end{definition}