Question

Define the S.I. unit of electric current.

Hint:

Current is measured using an ammeter connected in series in a circuit.

Answer 1

Definition of S.I. Unit of Electric Current:

The S.I. unit of electric current is ampere (A).

Definition:
One ampere is defined as the amount of electric current flowing through a conductor when one coulomb of charge passes through a cross-section of the conductor in one second. Mathematically, \[ 1 \, \text{Ampere} = \frac{1 \, \text{Coulomb}}{1 \, \text{second}} \] \[ I = \frac{Q}{t} \] where
I = current
Q = charge
t = time

In simple words:
If 1 coulomb of electric charge flows in 1 second through a conductor, the current flowing is 1 ampere.

Conclusion:
The S.I. unit of electric current is ampere (A), and it measures the rate of flow of electric charge through a conductor.