?? 01static electricity basic concepts of electricity.mht
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Subject: Static electricity : BASIC CONCEPTS OF ELECTRICITY
Date: Tue, 18 Nov 2008 11:23:02 +0800
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<LI><A title=3D"Page 1: Static electricity"=20
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/1.html">Static=20
electricity</A>
<LI><A title=3D"Page 2: Conductors, insulators, and electron flow"=20
=
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/2.html">Conductors, =
insulators, and electron flow</A>
<LI><A title=3D"Page 3: Electric circuits"=20
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/3.html">Electric=20
circuits</A>
<LI><A title=3D"Page 4: Voltage and current"=20
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/4.html">Voltage =
and=20
current</A>
<LI><A title=3D"Page 5: Resistance"=20
=
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/5.html">Resistance</=
A>
<LI><A title=3D"Page 6: Voltage and current in a practical circuit"=20
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/6.html">Voltage =
and current=20
in a practical circuit</A>
<LI><A title=3D"Page 7: Conventional versus electron flow"=20
=
href=3D"http://www.allaboutcircuits.com/vol_1/chpt_1/7.html">Conventional=
versus=20
electron flow</A>
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href=3D"http://www.allaboutcircuits.com/worksheets/basic.html">Basic=20
electricity worksheet</A>
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<H1>Static electricity</H1>
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</DIV><A name=3D"Static electricity"></A>
<P>It was discovered centuries ago that certain types of materials would =
mysteriously attract one another after being rubbed together. For =
example: after=20
rubbing a piece of silk against a piece of glass, the silk and glass =
would tend=20
to stick together. Indeed, there was an attractive force that could be=20
demonstrated even when the two materials were separated: </P>
<P><IMG src=3D"http://sub.allaboutcircuits.com/images/00001.png"> </P>
<P>Glass and silk aren't the only materials known to behave like this. =
Anyone=20
who has ever brushed up against a latex balloon only to find that it =
tries to=20
stick to them has experienced this same phenomenon. Paraffin wax and =
wool cloth=20
are another pair of materials early experimenters recognized as =
manifesting=20
attractive forces after being rubbed together: </P>
<P><IMG src=3D"http://sub.allaboutcircuits.com/images/00002.png"> </P>
<P>This phenomenon became even more interesting when it was discovered =
that=20
identical materials, after having been rubbed with their respective =
cloths,=20
always repelled each other: </P>
<P><IMG src=3D"http://sub.allaboutcircuits.com/images/00003.png"> </P>
<P>It was also noted that when a piece of glass rubbed with silk was =
exposed to=20
a piece of wax rubbed with wool, the two materials would attract one =
another:=20
</P>
<P><IMG src=3D"http://sub.allaboutcircuits.com/images/00004.png"> </P>
<P>Furthermore, it was found that any material demonstrating properties =
of=20
attraction or repulsion after being rubbed could be classed into one of =
two=20
distinct categories: attracted to glass and repelled by wax, or repelled =
by=20
glass and attracted to wax. It was either one or the other: there were =
no=20
materials found that would be attracted to or repelled by both glass and =
wax, or=20
that reacted to one without reacting to the other. </P>
<P>More attention was directed toward the pieces of cloth used to do the =
rubbing. It was discovered that after rubbing two pieces of glass with =
two=20
pieces of silk cloth, not only did the glass pieces repel each other, =
but so did=20
the cloths. The same phenomenon held for the pieces of wool used to rub =
the wax:=20
</P>
<P><IMG src=3D"http://sub.allaboutcircuits.com/images/00005.png"> </P>
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