Explain how electric current is formed. Give a suitable example.

(N/A) Electric current is defined as the rate of flow of electric charge through a cross-section of a conductor. When charges (typically electrons in a metal) move in a specific direction due to an applied electric field,an electric current is formed.
Electric charge is of two types:
$(1)$ Positive charge
$(2)$ Negative charge
In nature,electric current can be produced under certain conditions. For example,lightning in the sky is a natural phenomenon where a large amount of charge flows between clouds or between a cloud and the earth. However,this is not a steady flow of charge.
In devices used in our day-to-day life,such as a torch or a battery-operated clock,a steady flow of charge is maintained by a source of electromotive force (like a cell or battery),which results in a constant electric current.