We know already that that everything is made up of atoms which consist of nucleus (positive charge) and electron (negative charge) around the atoms.
Electric current is the movement of electrons. Electron speed is around light speed i.e. 299,342 kilometres per second.
Electrons move so fast in electrical circuits that electrical circuits seem to work instantly. It is defined that direction of electric current flow is reversed with electron flow direction.
The unit of electric current is Ampere (A) and it is measured by Ammeter. Symbol of electric current is I.
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