Switches are used to control power to a load. They can be found on anything that runs on electricity. They can be used to control power to garbage disposals, exhaust fans, ceiling fans, gas fireplaces, receptacles, appliances and electronics.
When a switch is off (open), the circuit path is open and no current flows through a circuit. When a switch is on (closed) a continuous path is created to allow current to flow through the circuit and energize the load.
Single Pole Switch
A single pole switch is the most common type of switch. It has two terminals and it is either open or closed. A switch must be connected to the line side of a load and not the neutral. If a switch is connected to the neutral side of a light bulb (or other load) the bulb will always be connected to the line even when the switch is turned off.
Ground is not shown In the diagrams below.
Toggling Single Pole Light Switch
Decora Style Switches
Decora style is a decorative version of switches. Decora style is about 3 ½ times more expensive than standard switches. Some homeowners replace their standard switches to decora as an upgrade. Decora switches are available in single pole, 3-way, and 4-way.
Decora style switch
Open Single Pole Light Switch
The circuit path is open and no current flows through a circuit.
Closed Single Pole Light Switch
A continuous path allows current to flow through the circuit and energize the load.