Three Wire Light Switch. First identify the wires that you will use. A 3 way switch makes it possible to turn the power on and off from more than one location.
A fan or other appliance. First identify the wires that you will use. All the white wires are capped together and the same is for the ground wires.
Of the three black wires only one of them is hot.
This is the wire that connects your switch to your light bulb or other load ie. Single pole switch with 3 black wires. First identify the wires that you will use. 4 way switches are added when there are three or more locations.
