Em 28/03/2014 02:41, Justin Richards escreveu:
> When a mechanical force is applied to a crystal causing it to distort, th=
e
> crystal produces an electric field.
>
> This can be seen as a spark in the case of a piezoelectric lighter when a
> hammer strikes the xtal.
>
> My question, does the xtal loose anything of itself each time it releases=
 a
> spark.  As the spark is a stream of electrons, makes me think that the
> crystal is loosing electrons.
>
> However, intuitively, I think the it is not reducing or decaying and is
> similar to introducing a magnetic field to a coil.  A current is induced =
in
> the winding.
>
> So then I ask the question, is the permanent magnet becoming less of a
> magnet each time it is used to induce a current in the winding.
>
> I am tempted to think the magnet does loose its magnetism but not sure.
>
> What say ye.
>
> Regard sJustin


When struck, the crystal becomes a bi-pole and the electron current just
circulates across the negative pole -> wiring -> spark gap -> wiring ->
positive pole circuit.

The same for the coil. The energy added by the impact or magnetic field
moves the electrons, nothing is created or destroyed.


Isaac

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