At every instant the product of voltage and current is positive, indicating that the direction of energy flow does not reverse.

Because the river is nearly flat, however, the direction of flow through the lagoons sometimes reverses after heavy rains.

As the button slows, pull on the string again and its direction will reverse.

It goes only one way at a time; the direction reverses depending on rush hour traffic direction.

One of them, with direction exactly reversed, will stop us, relative to the earth.

Upon sitting after a positive maneuver the direction of nystagmus should reverse for a brief period of time.

When the current direction reverses, the accumulated charges are removed from the base region.

The direction of the flow reverses with each change of tide.

At the companion table, with directions reversed, the identical boards were played.

Later, the direction reverses and turns into a full depth blotch.