What is Triode?
{{expert-subject|date=January 2024}} A '''triode''' (“valve” in [[British English]]) is a type of empty tube with wires in it ([[vacuum tube]]). It is not a vacuum tube [[diode]], which has only two wires [[electrode|(electrodes)]], but has a third electrode, called the [[grid]] between the 2 wires ([[cathode]] and [[anode]]). The word “triode” comes from the word parts “tri” (three) + “ode” (way, road). == How it works == When the cathode becomes hot, it gives out electricity particles ([[electron]]s). These electrons are then taken by the anode. This makes an electric movement (current), which is controlled by the grid. The grid “checks” how many electrons can pass through, and “eats” the extra ones. The grid lets the triode to be used as an electric amount changer ([[amplifier]]). The grid can also quickly change the amount of electrons it lets through, so it can also be part of an [[oscillator]] and wave taker (detector). == History == Philipp Lenard created the “grid” idea in 1902 to make an electron taker. The diode (Fleming valve) was created by John Ambrose Fleming in 1904. [[Lee De Forest]] and Robert von Lieben created the triode in 1908 from his original [[Audion]] diode of 1906. The triode is used as an [[amplifier]] (electric amount changer). The name triode was created because people needed to know which kind of vacuum tube it is, rather than a [[diode]], [[tetrode]], or [[pentode]]. People wanted to talk to people far away. They used triodes to talk, by triode [[radio]] [[receiver]]<nowiki/>s and triode radio [[transmitter]]<nowiki/>s. At first they only sent [[Morse code]] but better triodes later allowed talking by radio. The triode transmitters were so good that they replaced the [[Crystal radio|crystal]] transmitters to make the new listening devices ([[earphones]]). This made the first way of talking far away, creating the beginning of radio [[broadcasting]] around 1920. This made far away telephones better. Then the [[Bell Telephone Laboratories|Bell Telephone]] group made even