Dimmable LED Light Dimmer Switch
Dimmers are devices connected to a light fixture and used to lower the brightness of light. By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output. Modern dimmers are built from semiconductor instead of variable resistors, because they have higher efficiency. A variable resistor would dissipate power as heat and acts as a voltage divider. Since semiconductor or solid-state dimmers switch quickly between a low resistance “on” state and a high resistance “off” state, they dissipate very little power compared with the controlled load.