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In electronics, a vacuum tube, electron tube (in North America), thermionic valve, tube or valve is a device controlling electric current through a vacuum in a sealed container. The container is often thin transparent glass in a roughly cylindrical shape. Electrical contacts are usually made to variously shaped plugs at the base. They are used for rectification, amplification, switching, or similar processing or creation of electrical signals. Tubes rely on thermionic emission of electrons from a hot filament or hot cathode. Electrons travel to the anode (or plate) when it is at a positive voltage with respect to the cathode. Additional electrodes between the cathode and anode regulate current, allowing a tube to amplify or to switch.
Tubes were critical to the development of electronic technology, which drove the expansion and commercialization of radio broadcasting, television, radar, sound reinforcement, sound recording and reproduction, large telephone networks, analog and digital computers, and industrial process control. Although some applications had counterparts using earlier technologies such as the spark gap transmitter or mechanical computers, it was the invention of the triode vacuum tube and its capability of electronic amplification that made these technologies widespread and practical.
In most applications solid-state devices such as transistors and semiconductor devices have replaced tubes. Solid-state devices last longer, are smaller, more efficient, more reliable, and cheaper than tubes. Tubes can be fragile, sometimes generate significant unwanted heat, and can take many seconds-many minutes in critical applications-after powering on to warm to a temperature where they perform within operational tolerance. However, tubes still find uses where solid-state devices have not been developed, are impractical, or where a tube has superior performance, as with some devices in professional audio and high-power radio transmitters. Tubes are still produced for such applications.
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What are vacuum tubes and transistors?
They are devices that are used to control the flow of current.
What is the purpose of vacuum lines in auto engines?
Engine vacuum can be used to operate all kinds of devices in your car, from vacuum modulators in the transmission to the devices that open and close the doors for your cabin heating and cooling. Vacuum lines are the tubes that deliver the engine vacuum to those devices.
Why modern devices use integrated circuit instead of vacuum tubes?
Modern devices use integrated circuits instead of vacuum tubes because integrated circuits occupy less space than vacuum tubes, are more efficient, consumes less energy and are more reliable than vacuum tubes.
What is vacuum tubes define?
Vacuum tubes are electronic devices that control the flow of electrons in a vacuum. They were widely used in early computer and radio technology before being replaced by transistors. Vacuum tubes can amplify signals and are known for their warm, vintage sound in audio equipment.
Who invented the vacuum tubes and storage devices?
Vacuum tube was invented by lee de forest .
What other devices use vacuum tubes?
Vacuum tubes still find uses where solid-state devices have not been developed, are impractical, or where a tube has superior performance, as with some devices in professional audio and high-power radio transmitters. Tubes are still produced for such applications.
How many vacuum tubes are in the Univac I computer?
It used 5200 vacuum tubes.
What are the two most recognizable types of electron tubes?
The two most recognizable types of electron tubes are vacuum tubes and cathode ray tubes. Vacuum tubes are electronic devices that control electrical signals, while cathode ray tubes are used in older television and computer monitors to display images.
What did integrated circuits replaced?
The integrated circuit replaced vacuum tubes in electronic devices. This improved electronic devices because the two main problems with vacuum tubes were: 1. Heat generation/ power consumption and 2. Fragility
Is vacuum tube ohmic or non-ohmic and why?
Vacuum tubes are non-ohmic devices because their resistance changes with voltage and current. This non-linearity in resistance is due to the nature of the electron flow within the vacuum tube, causing it to exhibit non-ohmic behavior.
What is tube count?
Tube count refers to the number of vacuum tubes or electron tubes present in an electronic device. Vacuum tubes are electronic components used to amplify, switch, or create electrical signals in various electronic devices such as radios, televisions, and amplifiers. The tube count helps determine the complexity and functionality of the electronic device in which they are used.
Vaccum tubes were replaced by what?
Vacuum tubes were largely replaced by transistors. Transistors are smaller, more reliable, and generate less heat compared to vacuum tubes. This transition led to the development of smaller and more efficient electronic devices.
