Electrical current
  Electric current                Controlled movement of electrons through a substance.           Random motion of electrons will not constitute current unless there is a net transfer of charge with time.             Rate of transfer of electric charge.             Unit: ampere (A) or coulomb/second.            Conventional direction of current is from positive potential to negative.             Electrons will flow from negative potential to positive.             Current flows when a potential difference exists across the terminals of a closed electrical circuit.     Note:             Charge is something body attains when it loses or gains an electron.          Unit of electric charge is Coulomb.          Like charges repel each other a...