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An electric current in which the movement of charge repeatedly changes direction.

Whether its polarity stays the same or reverses determines whether it produces direct or alternating current.

Describe d.c. and a.c. in terms of charge movement: one direction only for d.c.; repeatedly changing direction for a.c.

An electric current in which the movement of charge repeatedly changes direction.

Whether its polarity stays the same or reverses determines whether it produces direct or alternating current.

Describe d.c. and a.c. in terms of charge movement: one direction only for d.c.; repeatedly changing direction for a.c.

Alternating current (a.c.)