Re: electricity
- From: "Pmb" <someone@xxxxxxxxxxxxx>
- Date: Wed, 31 Oct 2007 06:43:53 -0400
"G=EMC^2 Glazier" <herbertglazier@xxxxxxxxx> wrote in message
news:25453-47274213-984@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Pete Thanks for clearly pointing that out to Sam I could think out
exactly what you posted so very well. Sam can't use his brain for
thinking things out,and he miss read Google. Reality is Pete
if I went to the library it would not have a book saying that electrons
can be stored. Best short definition for electricity is "Its the flow of
electrons' This is elementary Bert
Bert - How's your historical knowledge of the history of electrodynamics?
I'm working on a very brief history. Here is what I've gathered during my
research.
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Historical Outline of Electrodynamics
600 B.C - Thales of Miletus, a Greek mathematician, astronomer and
philosopher, noted that when amber is rubber with silk it produces sparks
and can attract bits of straw, silk or other light objects. It should be
noted that the Greek word for amber is elektron. This term will be used
thousands of years later in creating new terminology such as electron,
electronics, electric, electricity, electrodynamics, etc. Thales also noted
the attractive power of a natural magnetic rock called loadstone found in a
place called "Magnesia." This word will also be used later to refer to
magnet, magnetism and other such terminology.
1269 A.D. - Peter Peregrinus of Maricourt from Picardy using a globular
magnet or loadstone and let a needle set on the magnet and, when the needle
settled, drew a lines parallel to the needle. Eventually the entire globe
was covered with lines. The lines formed circles which crossed at two points
on opposite sides of the magnet which reminded him of the meridians on earth
which all passed through the north and south poles of the magnet. Struck by
the analogy Maricourt proposed to call these two points on the magnet the
poles of the magnet. [Whittaker pages 33-34]
1600 A.D. - William Gilbert of England performed the first systematic
experiments of electric and magnetic phenomena. His results were described
in is famous book De Magnete. Gilbert also invented the electroscope for
measuring electrostatic effects. He was also the first person to realize
that the earth itself is a huge magnet as well as demonstrate that amber was
not the only substance that displayed electrification properties. Gilbert
was the one who used the term electric to refer to the forces that, e.g. a
piece of amber rubbed with silk exerted on bits of matter. Thus he
originated the term electric force.
1750 A.D. - Benjamin Franklin of America experimented with electricity that
led him to his invention of the lightning rod. He is also credited for the
law of conservation of charge and also determined that there were both
positive and negative charges.
1795 A.D. - Charles Augustine de Coulomb of France measured electric and
magnetic forces with a delicate torsion balance. The results of these
experiments resulted in what is now referred to as Coulomb's Law.
1800 A.D. - Alessandro Volta of Italy invented the voltaic cell and,
connecting them in series, created the first battery.
1819 A.D. - Hans Christian Oersted, during a lab demonstration, accidentally
found that a current carrying wire caused a nearby compass needle to deflect
thus discovering that electric current produces magnetism.
1820 A.D. - Michael Faraday of London showed that a time varying magnetic
field produces an electric current. Thus Faraday showed that magnetism could
produce electricity.
1873 A.D. - James Clerk Maxwell used Faraday's investigations to enable him
to establish the interdependency of electricity and magnetism. In his
classic treatise of 1872 he published the first unified theory of
electricity and magnetism and founded the science of electromagnetics.
Maxwell also postulated that light was an electromagnetic wave.
1888 A.D. - Heinrich Hertz of Germany vindicated Maxwell's theories by
generating radio waves of about 5 meters in wavelength.
1905 A.D. - Albert Einstein gave a critical analysis of Maxwell's theory
that resulted in a new formulation of ideas about space and time. Einstein
showed that the electric and magnetic field were simply two parts of a
single field that is now referred to as the electromagnetic field.
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This will go on a new web page called "Laws of Electrodynamics" which is a
direct step by step coverage of the laws of EM without the distraction of
many examples. It is not meant to teach EM since I have a web site that does
that. This will simply be the first page in that site.
If anyone else has some knowledge of the aforementioned history and woulc
care to comment on the material above I would appreciate it. Would
references to my sources be warrented? I think it will so as of now I intend
on adding that later today.
Thanks
Pete
.
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