Fascinating stuff.
Did you see the follow-up too?
Agreed, and sometimes that leads us to the wrong conclusions and those beliefs are sometimes held for long times and sometimes carry thru to support or disprove other beliefs too.We all keep a quite simplified version of the world, for practical reasons.
Interesting. Poyntings vector is usually associated with electromagnetic waves (as he says) rather than circuits. But power is of course also given by current*voltage drop, analogous to fluid flow*pressure drop in hydraulics. Much easier to calculate!Then try to follow this --
Interesting. Poyntings vector is usually associated with electromagnetic waves (as he says) rather than circuits. But power is of course also given by current*voltage drop, analogous to fluid flow*pressure drop in hydraulics. Much easier to calculate!
That's right, so thin-walled tubes are as good as solid wires for high frequencies.We do all have to simplify things, to a level where we can make sense of them....
Another little known effect, is the 'skin effect', as ac frequencies move towards rf frequencies, the current flow, tends to be around the outer skin of the conductor. The higher the frequency, the more pronounced the effect.
That's right, so thin-walled tubes are as good as solid wires for high frequencies.
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