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A common dual dimmer module used in stage lighting A dimmer. A dimmer is a device connected to a light fixture and used to lower the brightness of the light.By changing the voltage waveform applied to the lamp, it is possible to lower the intensity of the light output.
Some have a knob that can be turned by fingers, or a small slot that requires a screwdriver to change them. Typically, rotary types are available in two different types of output, 1) a binary encoded output, where 10 ( BCD ) or 16 (hex) choices are encoded into a 4-bit binary output, or 5 to 8 choices are encoded into a 3-bit binary output.
Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]
Two control knobs for a heating/cooling system. The left knob controls the temperature while the right controls the fan speed. A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input.
dim (trans. v.), dimmer (switch) to reduce the intensity of a domestic, industrial or other light; hence dimmer (switch) to lower a vehicle headlight's beam, typically when approaching vehicles travelling in the opposite direction at night (UK: dip); hence dimmer switch (UK: dip switch) diner one who dines railroad dining car (UK: restaurant car)
One criticism is that because the pointing stick depends on the user's applying pressure, it can cause hand cramps (although this can be partly solved by setting the sensitivity higher and lifting the finger when the pointer is not being moved). Another criticism is that it stresses the index finger and may lead to repetitive strain injury.