Re: off topic.. but...

Jeremy Hay-Draude /
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I'm a little late on the discussion here, and as a moped newby my opinion may not be worth as much as Don's or Fred's, but as an electrical engineer, I have some expertise here.

An an alternator works on the principle that when a conductive material moves through a magnetic field, it induces current flow. (the coils spinning in a magnetic shell)

A motor works on a similar premise where when a current flows through a magnetic field, it produced a physical force on the conductive material. (charged coils wrapped around a shaft)

These two premises counteract each other.

The current generated by the alternator creates a force which acts in the opposite direction of the force that is driving the alternator (in essence, the alternator turns itself into a motor which wants to turn the opposite direction of the mechanical force that is spinning the alternator).

Because of this, the more current being produced by the alternator, the more physical force is required to turn the alternator (similarly, the more power that is required from an electrical motor, the more current must be supplied to it). If we were dealing with a 100% lossless system (no friction, no electrial resistance, perfect magnetic flux) we would get exactly as much power out (electrical) as is put in (mechanical). But, since this is the real world, you will ALWAYS need to put more mechanical energy into the system than you get out as electrical energy.

I'm not sure how much sense that makes, but it's the result of the first law of thermodynamics (if we want to get really picky, we can throw the 2nd law in as well but it isn't needed at this point)

This single post is part of a larger thread. Start from the top or view this post in context.
Subject Written By Posted
  off topic.. but...Topic by: duck duck 05/02/02 12:18AM
  Re: off topic.. but...Re: Brandon Eliason Brandon Eliason 05/02/02 12:34AM
  Re: off topic.. but...Re: Chucky D Chucky D 05/02/02 12:56AM
  Re: off topic.. but...Re: Richard Richard 05/02/02 01:07AM
  Re: off topic.. but...Re: Ron Brown Ron Brown 05/02/02 11:19AM
  Re: off topic.. but...Re: duck duck 05/02/02 04:29PM
  we can do anything, if we had the $$Re: InfectedBootSector InfectedBootSector 05/02/02 05:46PM
  Re: off topic.. but...Re: Spike Bachman Spike Bachman 05/02/02 04:57PM
  Re: off topic.. but...Re: duck duck 05/02/02 05:40PM
  Re: off topic.. but...Re: duck duck 05/02/02 05:42PM
  Re: off topic.. but...Re: Jeremy Hay-Draude Jeremy Hay-Draude 05/03/02 09:25PM
  Re: off topic.. but...Re: Andy Andy 05/02/02 05:49PM
  Re: off topic.. but...Re: don-ohio don-ohio 05/02/02 06:11PM
  On topic..,Question, Ideas.Re: Wayne Wayne 05/02/02 06:43PM
  Re: On topic..,Question, Ideas.Re: don-ohio don-ohio 05/02/02 06:59PM
  Patent office (On topic) Free EnergyRe: Wayne Wayne 05/02/02 07:00PM
  Re: off topic.. but...Re: duck duck 05/02/02 06:12PM
  im going to try itRe: duck duck 05/02/02 06:23PM
  Re: im going to try itRe: Ron Brown Ron Brown 05/03/02 10:52AM
  Re: off topic.. but...Re: Chucky D Chucky D 05/04/02 04:29PM
  Re: off topic.. but...Re: Wayne Wayne 05/04/02 04:54PM
  ronRe: duck duck 05/04/02 09:49PM
  Re: ronRe: Ron Brown Ron Brown 05/05/02 11:43AM

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