PhysicsWhat is an electric current ? What makes an electric current flow in a wire ?
What is an electric current ? What makes an electric current flow in a wire ?
Solution:
The flow of charge in a particular direction constitutes the electric current. Current is measured in Ampere. Quantitatively, electric current in a conductor across an area held perpendicular to the direction of flow of charge is defined as the amount of charge is flowing across that area per unit time.Current density at a point in a conductor is the ratio of the current at that point in the conductor to the area of cross section of the conductor of that point.The given figure shows a steady current flows in a metallic conductor of non uniform cross section. Current density depends inversely on area, so, here J1>J2, as A1
