Scalar quantities possess magnitude only, however, vector quantities have both magnitude and direction. Electric current has both magnitude and direction but there exist other factors that show it is a scalar quantity. It follows scalar addition, that is, quantitative value is derived and does not change due to the direction, since the positive and negative charge take care of the direction of electric current. It does not follow the vector law of addition, and be resolved into components, so it cannot be a vector quantity. Hence, electric current is a scalar quantity.