MadSci Network: Physics
Query:

Re: Static Electricity-What amperage is associated with Static Electricity

Date: Tue Oct 19 18:36:14 1999
Posted By: Lawrence Skarin, Faculty, Electrical Engineering, Monroe Community College
Area of science: Physics
ID: 940334354.Ph
Message:

By definition, current is charge in motion.  The usual mechanism is 
electrons moving, but any charged particle (ions, "holes") qualifies.

A graph of current versus time can describe the phenomenon.  A lightning 
strike may have 10,000 amperes lasting for 2/10ths of a second.  If the 
current were constant over the 0.2 second, a total of 2,000 coulombs will 
have been transferred.

"Static" electricity occurs when voltage is built up by some mechanism 
that creates an excess of electrons in one place relative to another.  It 
is important not to confuse the electric pressure -- voltage difference -- 
with the current -- charge flow.

Current, when it happens, can relieve charge imbalance.  Because static 
electricity occurs on surfaces insulated from any potent source of charge, 
the current (amperage) associated with a discharge will be of short 
duration, but it may be high as in lightning, or low as with charge 
imbalance leaking through the tires to the wet ground on a landed airplane.

So it's only when the charge imbalance is being neutralized does current 
exist.  If the electric path is easy (conductive) the current will be high 
for a short time.  If it's difficult (relatively nonconductive) the 
current will be low, but for a long time.

Try Bill Beaty's site at Beaty's site  He's done a 
lot on static electricity and is a clear explainer on the subject.

Larry Skarin




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