Theory:

Electric current is known as the flow of electric charges in a particular direction. The amount of electric charges passing through a conductor in one second is known as the magnitude of electric current.
The formula is written as,
 
Electriccurrent=AmountofelectricchargeTimeI=Qt
 
Where, \(I\) is the electric current, \(Q\) is the electric charge, and \(t\) is the time of charge flow.
 
Сoulomb (\(C\)) is the unit of electric charge, and Ampere (\(A\)) is the SI unit of electric current.
One ampere is the amount of current flowing through a conductor if one coulomb of charge flows through it in one second.
In other words, Ampere is a unit of electric current equal to a flow of one coulomb per second.
 
Measuring device
An ammeter is an instrument used for measuring electric current in a circuit.
 
13691094544_4f0b389176_b.jpg
 
A battery, an ammeter and a bulb connected in series make a simple electric circuit. An ammeter can measure the current flowing in an electric circuit.
 
13691080074_ba71abaf5d_b.jpg
 
Solved example
When \(3\) coulomb of charge flows through a circuit for \(15\) \(seconds\), what will be the amount of current flowing through it?
 
Charge, \(Q\) \(=\) \(3\ C\)
 
Time, \(t\) \(=\) \(15\ s\)
 
I=Qt=315=0.2A
 
Thus, the current flowing through the circuit is \(0.2\ A\).
Reference:
https://live.staticflickr.com/3818/13691094544_4f0b389176_b.jpg
https://live.staticflickr.com/3816/13691080074_ba71abaf5d_b.jpg