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- From: rose@bucknell.edu (philip rose `94)
- Newsgroups: comp.sys.hp48
- Subject: Re: Volts vs. amps
- Date: 27 Jan 1993 17:50:16 GMT
- Organization: Bucknell University, Lewisburg, PA
- Lines: 33
- Distribution: world
- Message-ID: <1k6i0oINN75m@coral.bucknell.edu>
- References: <C1DB0J.G7u@ns1.nodak.edu> <1k2150INN3ct@coral.bucknell.edu> <C1G52r.HK2@ns1.nodak.edu>
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- In article <C1G52r.HK2@ns1.nodak.edu>, jgreff@plains.NoDak.edu (Jason Greff) writes:
-
- |> I've got training as a generator mechanic and I am an electrical engineering
- |> student specializing in power. Everyone I've ever talked to says current
- |> is the killer. Specifically the minimum is 100 milliamps, it may take
- |> more depending on the situation.
- |>
-
- As a fellow EE student, I have considered your objection. One of the end
- results of electrocution is the condition that the body's nerves no longer
- conduct electricity. Nerves must conduct electricity so that the brain can
- send electrical signals to the rest of the body. Nerves are very thin and
- can be modeled as a very thin wire. It is true that a normal wire melts if
- you run too much current through it, but the wire wouldn`t melt if it was a
- superconductor. Since nerves are more like wires than superconductors, the
- resistance of the nerve causes a voltage drop that is proportional to current.
- The power dissipated in the nerve is the product of the voltage drop and the
- current. This power is dissipated in the form of heat. If this power
- dissipation is high enough, the nerve will reach a temperature at which it
- will start to cook. The rest of a person's body can cook the same way, but
- the nerves usually cook first because they are so thin. Nerves that are cooked
- (well done) don't conduct electricity anymore. At this point, the brain can't
- send signals to vital organs such as the heart and the person dies. So it is
- more accurate to say that power dissipation is what kills.
-
- Sometimes when you see someone who has survived getting struck by lightning,
- the person doesn't have use of their legs because the nerves that go to the
- legs have been burned but the nerves that go to the vital organs haven't been
- burned badly enough so that they don't conduct.
-
- -----------------------------------------------------------------------------
- Phil Rose
- rose@coral.bucknell.edu
-