?? 01static electricity basic concepts of electricity.mht
字號:
established=20
to be easily changed, and so it remains to this day. </P>
<P>Michael Faraday proved (1832) that static electricity was the same as =
that=20
produced by a battery or a generator. Static electricity is, for the =
most part,=20
a nusiance. Black powder and smokeless powder have graphite added to =
prevent=20
ignition due to static electricity. It causes damage to sensitive =
semiconductor=20
circuitry. While is is possible to produce motors powered by high =
voltage and=20
low current characteristic of static electricity, this is not economic. =
The few=20
practical applications of static electricity include xerographic =
printing, the=20
electrostatic air filter, and the high voltage Van de Graaff generator. =
</P>
<UL>
<LI><B>REVIEW:</B>=20
<LI>All materials are made up of tiny "building blocks" known as =
<I>atoms</I>.=20
<LI>All naturally occurring atoms contain particles called =
<I>electrons</I>,=20
<I>protons</I>, and <I>neutrons</I>, with the exception of the protium =
isotope=20
(<SUB>1</SUB>H<SUP>1</SUP>) of hydrogen.=20
<LI>Electrons have a negative (-) electric charge.=20
<LI>Protons have a positive (+) electric charge.=20
<LI>Neutrons have no electric charge.=20
<LI>Electrons can be dislodged from atoms much easier than protons or=20
neutrons.=20
<LI>The number of protons in an atom's nucleus determines its identity =
as a=20
unique element. </LI></UL>
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