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...