The motor spins in time with the AC frequency and periodically reverses the connections to the load at an instant when the sinusoidal current goes through a zero-crossing.

Periodically reversing the flow of air and fuel across the open hearth furnace.

The shaft also carries the commutator, a long-lasting rotary electrical switch that periodically reverses the flow of current in the rotor windings as the shaft rotates.

Also, electrodialysis reversal systems seek to minimize scaling by periodically reversing the flows of diluate and concentrate and polarity of the electrodes.

Moreover, the poles periodically reverse their orientation in a process called geomagnetic reversal.

The workers, who communicate through yelling, hand gestures, or radio, will periodically reverse their signs to allow time for traffic to flow in each direction.

Alternating current- A form of electric current in which the movement of electric charge periodically reverses direction.

The worm periodically reverses its position in its burrow.

The transistors are alternately switched on and off, periodically reversing the current in the transformer.

In alternating current (AC, also ac), the movement of electric charge periodically reverses direction.