Rotary switch facts for kids
A rotary switch is a special type of electric switch that you turn to change its setting. Imagine the dial on an old radio or a fan – that's often a rotary switch! Instead of just being on or off, these switches can have many different positions. Each turn to a new position can control a different part of an electronic device.
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What is a Rotary Switch?
A rotary switch works by turning a knob or handle. This action makes a moving part inside the switch connect with different electrical points. Think of it like a pointer moving around a circle, touching different spots. Each spot it touches completes a different electrical circuit. This allows you to choose from many options, not just two.
How Does a Rotary Switch Work?
Inside a rotary switch, there's usually a central part called a "wiper" or "rotor." This wiper moves when you turn the knob. Around the wiper, there are several fixed metal contacts. When the wiper moves, it connects with one of these contacts at a time. Each contact is wired to a different part of the device. For example, on a fan, one contact might be for "low speed," another for "medium speed," and a third for "high speed."
Where Are Rotary Switches Used?
Rotary switches are very useful because they can control many different functions from one spot. You might find them in:
- Home Appliances: Like the speed control on a ceiling fan, the temperature setting on an oven, or the program selector on a washing machine.
- Audio Equipment: Older radios, stereos, and amplifiers often use rotary switches to select different inputs (like CD, radio, or auxiliary) or change sound modes.
- Test Equipment: In science labs or electronics workshops, rotary switches are used on devices like multimeters to select what you want to measure (like voltage or current).
- Vehicles: Some car dashboards use rotary switches for lights or air conditioning settings.
They are popular because they are simple to use and can be very reliable.
Images for kids
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Bottom view of a 12-position rotary switch showing wiper and contacts.
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Rotary switch circuit
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Rotary switch handle as seen from below
