Theory:

Electric current is a flow of electirc charges, in a particular direction.
Ampere is the SI unit of Electric current and it is denoted as '\(A\)'.
  • Сoulomb (\(C\)) is the unit of electric charge.
  • Ampere is a unit of electric current equal to a flow of one coulomb per second.
  • The coulomb is defined as the quantity of electricity transported in one second by a current of one ampere.
  • 'One ampere' is defined as one 'coulomb' of charge moving in a conductor in one second.
Electriccurrent(I)=Amountofelectricchargesflowingthroughaconductor(Q) Time(t)I=Qt
Ammeter is the device used to measure the electric current.
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For example: When \(3\) coulombs of charge flow through a circuit for \(15\) seconds, calculate the current.   
  
Given: Charge \(Q  =  3\ C\); time \(t = 15\ s\)
  
Electriccurrent(I)=Amountofelectricchargesflowingthroughaconductor(Q)Time(t)I=QtI=315I=0.2A