Then the electric current density can be related with the Electric Field by the equation: J = Σ × E. Where, Here is a derivation from first principles. Suppose a medium (conducting material) has an electric conductivity given by $$\sigma$$. The standard unit of current is ampere and it is denoted by A. Conversely, a current of one ampere is one coulomb of charge(6.24 x 1018 charge carriers) going past a given point per second. There is a difference between the terms current and current density. In the study of electromagnetism, Current Density is the measurement of electric current. In Physics, the current density is defined as the amount of current that passes through per unit area of the given conductor. Since charge is conserved, current density must satisfy a continuity equation. What is the current density? It concerns the amount of current flowing across the given area. Current Density J (bottom) is the Current over a Specified Cross Section. The current density is a vector quantity, and it is expressed by the letter “J”. According to Physicists, Current is considered to move from relatively positive t… Suppose that the total current flow is … As a simple example, assume the current density is uniform (equal density) across the cross section of a wire with radius r =10 cm. Electric Current I (Top) is The Total Charge Flow Per Second. Answer:... 2) If 45 amperes of current is flowing through a battery with a given area of 8 m 2, what is the current density? The standard symbol of current is capital I. Current Density Formula Questions: 1) A current of 6 mA is flowing through a copper wire that has an area of 4 mm 2. We can define current as the flow of electrically charged particles, mostly in those atoms which are electron-deficient.