The most common switch in your house is a single-pole switch with a toggle marked “On” and “Off.” It typically is used to control a light fixture or a receptacle. Single-pole simply refers to electricity flowing in one direction. In most cases, one black (hot) wire is connected to one terminal screw (or it might be back wired), and a second hot wire is connected to the other terminal screw, proceeding on to the light. In terms of physics, a pole is just one of two opposite points on a magnet that manifest the magnetic properties. (Remember, a spinning magnet, called a dynamo, at your utility’s power plant creates the electric current.) Unlike older switches, modern versions often come with a ground terminal for the green or bare copper ground wire.
A single-pole switch controls the current to its load from one location only. Other witches control the current from two or even three different locations
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