Answer: C. wrist-watch
Explanation:
Alternating current refers to the current which changes direction. The current which is supplied to our home is alternating current which is used to run home appliances such as television, washing machine, electric hair dryer, ceiling fan etc.
A current which flows in only one direction is known as direct current. A cell or a battery is a source of direct current. A wrist watch runs on direct current provided by a cell attached to it.
