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Electric current can be defined as the rate of flow of charge through a particular area of cross section of a conductor. The current always flows in a direction which is from a region of higher potential to a region of lower potential. The direction of flow of electrons is opposite to direction of current because they carry negative charge and will move from a region of higher potential. Electric current is a scalar quantity.
Current density can be defined as the current flowing per unit cross-section area, and is a vector quantity. Its direction is the same as that of current.
The important topics covered under current electricity include drift velocity, resistance, measurement and variation of resistance, emf of a cell, Kirchhoff’s current and voltage laws and capacitance.
It is very important to master these concepts at early stage as this forms the basis of your preparation for IIT JEE, AIEEE, DCE, EAMCET and other engineering entrance examinations.