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dimmer switch

Primary Information
Secondary Information

Definition

A dimmer switch is a device that controls the brightness of a light bulb by varying the amount of electricity that flows through the bulb.

Dimmer switches work by using a variable resistor. A variable resistor is a resistor whose resistance can be changed. The resistance of the variable resistor in a dimmer switch is changed by rotating a knob.

When the knob is turned clockwise, the resistance of the variable resistor increases. This decreases the amount of electricity that flows through the light bulb, which makes the light dimmer.

When the knob is turned counterclockwise, the resistance of the variable resistor decreases. This increases the amount of electricity that flows through the light bulb, which makes the light brighter.

Dimmer switches are a common household appliance. They are used to adjust the brightness of lights in homes, offices, and other buildings.

How can the word be used?

I used the dimmer switch to make the lights in the living room brighter.

dimmer switch

Different forms of the word

Noun: dimmer switch.

Adjective: dimmer.

Verb: dim.

Adverb: dimly.

Synonym: rheostat.

Antonym: bright.

Etymology

The word "dimmer switch" comes from the word "dim", which means "to make something less bright". The word "dim" comes from the Old English word "dimme", which also means "to make something less bright".

Question

Why are dimmer switches useful?

AQA Science Exam Question and Answer

Question:

Describe the function and working principle of a dimmer switch. Explain how it allows control over the brightness of a light source and the scientific concept behind its operation. Provide examples of situations where dimmer switches are commonly used and their benefits.

Answer:

  • A dimmer switch is an electrical device used to control the brightness of a light source. It works by altering the amount of electrical power supplied to the light bulb, thereby regulating the intensity of light emitted. Dimmer switches operate based on the principle of pulse-width modulation (PWM), rapidly turning the power on and off in a specific pattern. By varying the width of the pulses, the switch controls the average power delivered to the light, resulting in a dimmer or brighter glow.
  • Dimmer switches find widespread use in various scenarios. For instance, they are commonly installed in home lighting systems, allowing users to adjust lighting levels according to different activities or moods. They also offer energy-saving benefits, as reducing light intensity reduces power consumption. In commercial settings, dimmer switches are employed to create ambience in restaurants, theatres, and hotels. Overall, dimmer switches provide flexible lighting control and help in conserving energy while enhancing the comfort and atmosphere of a space.