tag:blogger.com,1999:blog-7590176649168185428.post4158060605036408925..comments2024-03-28T06:58:15.720-04:00Comments on SolderSmoke Daily News: Which way does current REALLY flow?Bill Mearahttp://www.blogger.com/profile/07662500663603350847noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-7590176649168185428.post-31442416092615523562016-08-02T10:42:57.683-04:002016-08-02T10:42:57.683-04:00So, electrons flow from negative to postive. But...So, electrons flow from negative to postive. But they travel at speed of 80 cm/hr, which is very slow compared to rate at which the electrical energy is transfered. <br /><br />The velocity that the energy travels is C, or 3x80^8 M/s in a vacuum. C is always slower depending on the medium that the energy is transfering in whether it's a PCB, or coax, or wire. But my point is that the current that we think about when design and analysing circuits flows at this rate, and not the velocity of the electrons. So to say we should think about electron flow for current is not accurate without this consideration. <br /><br />We don't really need to think about the electron flow for most of our work in electronics. But, to understand things like circuit Q, and skin effect you do need to think about it.<br /><br />N8CAHnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-84916342786273329292016-07-27T01:20:30.087-04:002016-07-27T01:20:30.087-04:00The arrows in semiconductor devices generally poin...The arrows in semiconductor devices generally point to the N-type material (cathode in a diode, emitter in NPN, base in PNP, channel in a n-channel MOSFET, etc.).w2aewhttps://www.blogger.com/profile/13487833918600029532noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-36763560775091114212016-07-27T01:18:54.255-04:002016-07-27T01:18:54.255-04:00The arrows in semiconductor devices generally poin...The arrows in semiconductor devices generally point to the N-type material (cathode in a diode, emitter in NPN, base in PNP, channel in a n-channel MOSFET, etc.).w2aewhttps://www.blogger.com/profile/13487833918600029532noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-65054346232465204122016-07-26T16:03:03.397-04:002016-07-26T16:03:03.397-04:00OK, so we invert the nomenclature, that would make...OK, so we invert the nomenclature, that would make pro-tons anti-tons, right?Dex, ZL2DEXnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-18727961779272708432016-07-26T15:45:44.009-04:002016-07-26T15:45:44.009-04:00AB1YK I always look at the arrows as check valves...AB1YK I always look at the arrows as check valves so they work for me!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-16283905586036170152016-07-26T12:07:42.579-04:002016-07-26T12:07:42.579-04:00https://m.youtube.com/watch?v=wlMwc1c0HRQhttps://m.youtube.com/watch?v=wlMwc1c0HRQN8NMhttps://www.blogger.com/profile/00670056747080667518noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-73022913358356616692016-07-26T12:07:02.064-04:002016-07-26T12:07:02.064-04:00This comment has been removed by the author.N8NMhttps://www.blogger.com/profile/00670056747080667518noreply@blogger.comtag:blogger.com,1999:blog-7590176649168185428.post-52488089070289186842016-07-26T11:15:14.886-04:002016-07-26T11:15:14.886-04:00It's just too late for me, I -know- that elect...It's just too late for me, I -know- that electrons go the other way and that in valves they start off from the heated cathode obviously, but I just was brought up with thinking of current going from the positive and following the arrows in transistors. All our equipment uses negative for the chassis and it is simpler to think of the current ending up at the chassis and not originating there. Then when we get into the physics of the semiconductors we discover about holes and the direction that they travel. We can't see the electrons moving in tne wires so in the end it doesn't really matter which way they really go just as long as we stick to one convention. David Anderson GM4JJJhttps://www.blogger.com/profile/01308957902320184832noreply@blogger.com