Why don’t devices like fans reverse their direction despite using alternating current (AC), which changes direction?

Question

Why don’t devices like fans reverse their direction despite using alternating current (AC), which changes direction?

In: Physics

Answer 1

To make an analogy with a physical object, think of a ratcheting wrench. When you move it in one direction, it turns the bolt. When you move it the other direction, the ratchet lets it go back without turning the bolt. That means you can move the wrench back and forth, but it only makes the bolt tighter.

AC is basically like that but with electricity.