Understanding Single Pole and 3-Way Switches
Light switches are everywhere. Flip up, the light goes on. Flip down, the light goes off. But do you really know how they work? And what about 3-ways switches – those funky arrangements where one light is controlled by two different switches?
This video gives a great visual explanation of single pole (one switch controls a light) and 3-way (two switches control a light) switches.