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what is current? |
| When two charged bodies at different electric potentials are connected by a metal wire,then electric charges will flow from the body at higher potential to the one at lower potential (till they acquire the same potential).This flow of charges in the metal wire constitutes an electric current.It is the potential difference between the ends of the wire which makes the electric charges (or electric current) to flow in the wire.We know that the electric charges whose flow in a metal wire constitutes electric current are the negative charges called electrons. or in other words we can define electric current as : The electric current is a flow of electric charges (called electrons) in a conductor such as a metal wire.If a charge of Q coulombs flows through a conductor in time t seconds,then the magnitude I of the electric current flowing through it is given by : Current , I = Q / t The SI unit of electric current is ampere which is denoted by the letter A. |
