Switch facts for kids

This picture shows the inside of a light switch and how it works.

A switch is a device that can turn things on or off, or change how something works. Think of it like a gate that controls the flow of electricity in an electrical circuit. When you flip a light switch, you are either letting electricity flow to the light bulb (turning it on) or stopping the flow (turning it off).

Switches are not just for electricity. For example, a railroad switch changes which track a train will follow. When people talk about a "switch," they usually mean an electrical one. In many modern systems, like telephone networks, old mechanical switches have been replaced by electronic ones. These electronic switches can be controlled automatically by computers.

In mathematics and logic, a switch can be thought of as a "gate". These gates help represent ideas and arguments. The basic idea behind a computer is that it uses many tiny electronic switches. These switches act like logic gates to process information and make decisions.

What Are Different Types of Switches?

There are many different kinds of switches, each designed for a special job. They can be found in almost every electronic device you use. Some switches are simple, like the one for your light, while others are very complex.

Common Types of Electrical Switches

Here are some common types of switches you might find:

• DIP switch: These are small switches often found on circuit boards. They are used to set up electronic devices.
• Reed switch: This switch uses a magnetic field to open or close a circuit. They are often used in security systems for doors and windows.
• Rocker switch: These switches rock back and forth, like a seesaw. You often see them on power strips or appliances.
• Micro switch: These are very small switches that need only a tiny amount of pressure to activate. They are used in things like computer mice or car door sensors.
• Relay switch: A relay is an electrical switch that uses an electromagnet to operate. It allows a small amount of electricity to control a much larger amount.
• Rotary switch: This switch turns in a circle to select different options. You might find one on a fan to change its speed.
• Surface mount switch: These are tiny switches designed to be soldered directly onto a circuit board.
• Toggle switch: This switch has a lever that you flip up or down. It's a classic on/off switch, like the one for a lamp.
• Tilt switch: This switch detects if it's tilted or moved from its upright position. They can be used in alarms or toys.
• Time switch: This switch turns things on or off at specific times. You might use one to control outdoor lights.

How Switches Work in Computers

Computers use millions of tiny electronic switches to do their work. These switches are either "on" or "off," representing the numbers 1 and 0. This is how computers understand and process information. When these switches are combined in specific ways, they form "logic gates." These gates perform basic logical operations, like "AND," "OR," and "NOT." By combining many of these simple operations, computers can perform very complex tasks, from browsing the internet to playing games.

Images for kids

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  A toggle switch in the "on" position.

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  A triple-pole single-throw (TPST) knife switch used for braking a wind turbine. It is shown in the open position.

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  This image shows "switch bounce" on an oscilloscope. The switch quickly turns on and off several times before staying steady.

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  A three-deck stacked rotary switch. More sections can be added for more options.

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  A toggle switch with four inputs and outputs.

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  Toggle switches with a shared cover that stops certain combinations from being chosen.

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  An opened float switch from a dirty-water pump.

See also

In Spanish: Interruptor para niños