Generally, a switch is an electrical component that can "make" or "break" an electrical circuit, interrupting the current or diverting it from one conductor to another.
A light switch is a switch generally used to operate electric lights, permanently connected equipment, or electrical outlets. Table lamps that are portable may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be changed by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.
The switches may be single or multiple, designed for indoor or outdoor use. These days most switches are made of modern plastics. In some instances, especially in hospitals and other public facilities, parts of light switches are made of antimicrobial materials such as copper, for infection control.
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