Electric current is the rate of flow of the electric charges. The standard symbol for current is I. The electric charge is denoted by Q and its SI unit is Coulombs (C).

The SI unit for electric current is amperes and denoted by A. The instrument used to measure the electric current is called the ammeter.

The relationship between charge and electric current is given by the following equation:

Q = I × t                      

where Q is charge measured in Coulombs (C), I is electric current measured in amperes (A) and t is time measured in seconds (s).