Electromagnetism
Electricity · Magnetism · Magnetic permeability
Electrostatics Electric charge • Coulomb's law • Electric field • Electric flux • Gauss's law • Electric potential energy • Electric potential • Electrostatic induction • Electric dipole moment • Polarization density
Magnetostatics Ampère's law • Electric current • Magnetic field • Magnetization • Magnetic flux • Biot–Savart law • Magnetic dipole moment • Gauss's law for magnetism
Electrodynamics Lorentz force law • emf • Electromagnetic induction • Faraday’s law • Lenz's law • Displacement current • Maxwell's equations • EM field • Electromagnetic radiation • Liénard–Wiechert potential • Maxwell tensor • Eddy current
Electrical Network Electrical conduction • Electrical resistance • Capacitance • Inductance • Impedance • Resonant cavities • Waveguides
Covariant formulation Electromagnetic tensor • EM Stress-energy tensor • Four-current • Electromagnetic four-potential

An electric current is a flow of electric charge. The flow of electric current takes place by the movement of the electrons in a conductor. The equation of current is:

\displaystyle{ I = \frac{\Delta Q}{\Delta t} }

where

\displaystyle{ I } is the current flowing

\displaystyle{ \Delta Q } is the change in electric charge

\displaystyle{ \Delta t } is the change in time

The SI unit of electric current is the ampere (A). This is equal to one coulomb of charge in one second. Electric current can be found in wires, batteries, and lightning.