vaakumlampes
Vaakumlampes, often referred to as vacuum tubes or thermionic valves, are electronic components that control electric current by using the flow of electrons in a vacuum. They consist of a sealed glass or metal envelope from which the air has been removed, creating a vacuum. Inside this envelope are electrodes, typically a cathode and one or more anodes. When a voltage is applied, the cathode is heated, causing it to emit electrons. These electrons are then attracted to the anodes, creating a current flow.
The simplest form is a diode, which has a cathode and an anode, acting as a one-way
Vaakumlampes were fundamental to the development of radio, television, early computers, and audio amplification systems. Their