Dimmer switch
Switches and controls for electrical systems and devices have been developed that control more than one state of an electrical load or device. Dimmable lights permit the light intensity in a particular space to be varied to suit the immediate purpose for that room. Dimmer lighting and control systems are widely used in indoor lighting to provide a softer feel and more controllable illumination experience as compared to on/off lighting. Various methods of achieving variable light levels have evolved over the years. Many of these methods are based on the principle that the illumination intensity of a lighting load will vary proportionally to the amount of power delivered to the load. Dimmer switches are well known devices for saving electrical power to or varying the light intensity of an illuminating device usually between a fully on state and a fully off state. Dimmers may be operated with a toggle, a dial, a slide, a paddle switch, a touch-pad or electronic button; some types of dimmer switches integrate two or more of these methods to handle different tasks. Dimmer switches typically include a variable resistance which the user adjusts for varying the electrical power to the light source to alter the light source intensity. Dimmer circuits utilize semiconductor switches, such as triac and field effect transistors (FETs), to control the power supplied to the lighting load. Triacs regulate the proportional electrical power delivered to a load, and comprise the main power control element of a number of conventional dimmer switches used to control electrical lighting control loads.
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