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Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
I built a ZVS flyback driver with a pair of IRFP250s recently, I had a lot of fun playing it. The first time I tested it with alligator clips as electrodes, it turned very bright and sparks falls from the negative clip. then I tried it with a paper clip, it melted fast and lots of sparks fly off from it. Then I used a soldering stand to hold a penny and use the positive electrode to arc it, it soon turned black and melted, but no liquid metal though. the penny looked like a piece of crap after it cooled =D
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
From what I remember, the negative electrode gets so hot because of all the ions bombarding it. In neon lamps and other gaseous discharge displays, the negative electrode is always the one that heats the most and is the brightest.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
Yes, they do hit the positive electrode. Because the mass of the ions are a lot higher than the electrons, there is more heating on the negative one compared to the positive one. The positive one still does heat up because it's close to the plasma and also electrons are hitting it.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
If you heat water enough it will break the molecular bonds and release hydrogen and oxygen. Most of it will recombine back to water again but some will escape. There are hydrogen generators that use concentrated sunlight to make useful amounts of hydrogen.
Many materials will release unpleasant things when heated to a high temperature so if you are melting or evaporating something you should make sure to not breathe in the fumes unless you are sure it is safe.
Registered Member #152
Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384
I thought the positive electrode actually gets hotter, because of the electrons flying off the negative electrode and hitting the positive one.
But in the case of an arc in a gas, there are also other ions than electrons which carry the current, and they may be positively charged bombarding the negative electrode.
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why does the negative electrode get so hot?
