# Current Density Formula – Definition, Equations, Examples

#### In the field of electromagnetism, Current Density is the measurement of electric current (charge flow in amperes) per unit area of cross-section (m

#### J = current density in amperes/m

#### A = cross-sectional area of the conductor, m

#### 1) A current of 6 mA is flowing through a copper wire that has an area of 4 mm

#### J = 0.006 amps/0.004 m

#### J = 1.5 amps/m

#### 2) If 45 amperes of current is flowing through a battery with a given area of 8 m

#### J = 45 amps/8m

#### J = 5.63 amps/m

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