[Uram-rejections] Elementary musings

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> From: gareth <me at privacy.net>
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> Subject: Elementary musings
> Date: Sun, 12 Feb 2017 20:39:46 +0000 (UTC)
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> When I started out, it seemed that the phenomenom of resistance was
> intuitive, based on direct experience of electric fires and lamps, not
> forgetting the water pressure model, but those of inductance and
> capacitance were mysterious especially in the AC model where the PI/2
> phase shift came in, eg, how could current be delivered when the voltage
> is zero, etc. (No, I'm not asking that question today)
> 
> Later on, based on the storage of energy within the devices, capacitance
> and inductance were easy, but what actually happens in resistance?
> 
> Consider the model of conduction where energised electrons can only move
> from atom to atom  via unoccupied orbital energy levels, then what happens
> in a resistance when the electron gives heat energy to the material?  In
> dropping down an energy level, some form of photon must
> be given off, but how is that absorbed by the whole atom to increase the
> atom's vibration? (Yes, I am asking that question today, despite
> being completely au fait with series, parallel, Norton and Thevenin, etc)
> 
> Also, why is an electron in motion in a resistance more likely to release
> its energy than an electron in motion in, say, copper?
> 
> I do not have all the answers and googling sends me off to advanced
> physics (Schroedinger waves, quarks, etc) when what I seek is an
> explanation that is elevant to engineering rather then to physics,
> accepting that at each level of electrical engineering education there
> are models presented that are gross simplifications but gaining in
> sophistication as one's knowledge develops.
> 
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