A friend mentioned flux capacitor from the movie Back to the - TopicsExpress



          

A friend mentioned flux capacitor from the movie Back to the Future and it induced me to remark on something Ive wondered about the phrase as used in the movie. Namely, I suspect it was an inside joke on the part of the writer (was it Robert Zemekis who wrote the story?) I dont know...either that or a demonstration of his ignorance of how the component works which is also likely. ;) A capacitor consists of two thin sheets or plates of metal polarized in charge by a battery and separated by a dielectric to constrain the field. An electric field, between the plates. When the battery has a varying potential difference it induces a change in electric field density between the plates....a delay between the flux change and the induced potential on the plates allows energy to be stored IN the flux itself and gives rise to the useful property of capacitors to store energy in the electric field and then return it to allow modulation of input signal our secondary sources (like a driving current from an antenna picking up radio waves). Flux describes the tendency for charge variation on the plates to induce electric field density variation between them to be stored. Thus the flux is the rate of change of the field and all capacitors function requires the concept. The point is all CAPACITORS are flux capacitors by definition so the phrase is actually an oxymoron.
Posted on: Thu, 24 Oct 2013 03:39:11 +0000

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