. What is Electric current


Best Answer

Electric current across an area held perpendicular to the direction of flow of charge is defined to be the amount of charge flowing across the area per unit time. If charge Q passes through the area in time interval t , we define the average electric current

current

Instantaneous current at time ‘t’ is given by

current

The unit of current is ampere. Ampere (A) is the S.I. base unit, defined in terms of its magnetic effect. Smaller currents are more conveniently expressed in milliampere (1 mA = 10-3 A) or microampere 1μA  10 6 A .. 1 Ampere = 1 Coulomb/sec. Direction of current is along the direction of flow of positive charges or opposite to the direction of flow of negative charges, but current is a scalar quantity.

 

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