Question

describing alternating current
the direction of the current in an alternating current circuit
remains constant.
is direct.
changes repeatedly.
changes randomly.

Explanation:

To determine the correct option, we recall the definition of alternating current (AC). AC is defined as the type of electric current in which the direction of the current flow changes periodically (repeatedly) at regular intervals.

• The option "remains constant" is incorrect as that describes direct current (DC).
• "Is direct" is also incorrect as direct current has a constant direction, while AC does not.
• "Changes randomly" is incorrect because the direction change in AC is periodic and not random.
• "Changes repeatedly" matches the definition of alternating current, as the direction of current in an AC circuit changes in a repeated, periodic manner (e.g., in a sinusoidal AC, it changes direction at a fixed frequency like 50 Hz or 60 Hz).

Answer:

C. changes repeatedly.