What was the old tv/computer screen like? Electrons falling onto a phosphor screen
Here is the principle:
This is the principle of the classic TV/computer screen. The impression given by oscilloscopes and medical device screens (e.g. heart rate monitoring) comes closer to the idea.
Let us take a step back in time. We are at a time before the discovery of the electron and scientists observe that the heated metal, the cathode of the electric circuit, gives off some kind of rays. These are called “Cathode rays”. If you enclose the whole thing described above including the phosphor screen in a tube, then you have a “Cathode Ray Tube” (CRT) that was used in classic TVs and screens in general.
The interior of a cathode-ray tube for use in an oscilloscope. 1. Deflection voltage electrode; 2. Electron gun; 3.Electron beam; 4. Focusing coil; 5.Phosphor-coated inner side of the screen
A 14-inch cathode ray tube showing its deflection coils and electron guns
By Blue tooth7 - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=16981328
Anode means “ascent” and represents the fact that you have to make an effort to reach it. Electrons will easily “walk down” from the anode to the cathode electrode.
It was Thomson who discovered that the rays consisted of negatively charged particles which he named electrons.
Why “electron”? What is the etymology of the word?
The word “electron” comes from the greek word for “amber”, the word ἤλεκτρον/ΗΛΕΚΤΡΟΝ. In ancient greek eta was pronounced as a long vowel [ɛː] (εεε) (Linguist Prof. Babiniotis) and therefore in latin it is written as “electron”.
(In modern greek it is pronounced as [i] like the vowel of "is").
Amber as mentioned in wikipedia is fossilized tree resin and it “can acquire an electric charge by contact and separation (or friction) with a material like wool”. This property, first recorded by Thales of Miletus, suggested the word "electricity" (…).
Amber pendants made of modified amber.
Wood resin, the source of amber
By Emmanuel Boutet - Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=1388801
The Amber Room near St. Petersbourg, Russia
(cf. Baltic sea amber)