Electric current is the movement of electric charge through a conductor. The SI unit of electric current is the ampere (A), which is defined as one coulomb of charge passing through a point in one second.

Electric current can be produced in a variety of ways, including:

* Chemical reactions: When certain chemicals are mixed together, they can produce an electric current. This is the principle behind batteries and fuel cells.

* Mechanical motion: When a conductor is moved through a magnetic field, it can produce an electric current. This is the principle behind generators and motors.

* Thermal energy: When a conductor is heated, the free electrons in the conductor can become more energetic and move more freely, producing an electric current. This is the principle behind thermoelectric generators.

Electric current is used to power a wide variety of devices, including:

* Lights

* Appliances

* Computers

* Electric vehicles

* Industrial machinery

Electric current is an essential part of our modern world, and it is used in countless applications.