Among the statements about electric current, the correct one is: In an alternating current (a.c.) circuit, the flow of charge changes direction continually. This accurately describes the nature of alternating current where the direction of the current reverses periodically, unlike direct current (d.c.), which flows in a single direction.

Additionally, the fundamental understanding of electric current is that it is the flow of electric charge, usually electrons, through a conductor, and it requires a closed circuit path to flow. Electric current does not flow through an open circuit.

Thus, the correct statement about electric current is that in an a.c. circuit, the current changes direction continuously.