Electric Current It is defined as the rate of flow of positive charge. It has the direction towards the motion of positive charge and direction opposite to the motion of negative charge. It is denoted by I. Its SI unit is ampere(A) or C/s. It is of two types :- Direct current [DC] Alternating current [AC] Direct Current ( DC) The current which has a same direction of flow. It is of two types : 1. fluctuating current The current whose magnitude changes again and again is called fluctuating current. 2. Steady current or ideal current The current whose magnitude do not changes with time is called steady current. Alternating current (AC) The current which changes its direction of flow periodically. (In detail, chapter 7) On the basis of calculation Current is of two types : 1. Average current [ I = q/t ] It is defined as the ratio of total charge flow to the total time of flow. 2. Instantaneous current [ I = dq/dt ] It is defined as the ratio of small change in c
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