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  CBSE CLASS XII,  CURRENT ELECTRICITY , PHYSICS NOTES- (PART I) CURRENT ELECTRICITY CBSE Class XII Physics Chapter 3rd  CURRENT ELECTRICITY   Notes Study Material and Notes of Chapter 3 CURRENT ELECTRICITY Class XII Physics ACCORDING TO THE CBSE SYLLABUS 2025-26. CURRENT ELECTRICITY Current is defined as the rate of flow of charge. S.I. unit of Electric Current is Ampere (A) The directed rate of flow of electric charge through any cross-section of a conductor is known as  electric current. If ∆Q charge flows in time ∆t, then the current at any time t is Where, n = number of charged particles constitute the current Current is a scalar quantity. I is in the direction of flow of positive charge and opposite to the direction of flow of negative charge. SI unit of current is ampere and is represented by A. CURRENT DENSITY (j)   The current density at a point in a conductor is the ratio of the current at that point in the conductor to the area of cr...