Question

What is the SI base unit of electric current?
1. Coulomb-Second
2. Second-Coulomb
3. Ampere
4. Coulomb-minute

Answer 1

Correct Answer - Option 3 : Ampere
Electric Current:

• It is defined as the net amount of electric charge flows through a cross-section of a conductor in an electric circuit in a per unit time.
• If the number of electrons traveling in any direction will be equal to the number of electrons traveling in the opposite direction. So, there will be no net electric current.
• S.I unit of electric current is Ampere(A).
• It is a scalar quantity.

 

Current density:

• Current per unit area (taken normal to the current), I/A, is called current density.
• It is denoted by j.
• The SI units of the current density are A/m2. (A= Ampere, m= meter).
• E = j ρ (where, E= uniform electric field, j= current density, ρ= resistivity).