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- Newsgroups: comp.sys.hp48
- Path: sparky!uunet!spool.mu.edu!sdd.hp.com!elroy.jpl.nasa.gov!decwrl!csus.edu!netcom.com!payner
- From: payner@netcom.com (Rich Payne)
- Subject: Re: Exam mode in version J (var lock?)
- Message-ID: <1993Jan23.193545.22639@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1993Jan19.164320.14325@doug.cae.wisc.edu> <1993Jan23.030545.24088@netcom.com> <1993Jan22.224530.8625@doug.cae.wisc.edu>
- Date: Sat, 23 Jan 1993 19:35:45 GMT
- Lines: 73
-
- In article <1993Jan22.224530.8625@doug.cae.wisc.edu> kolstad@cae.wisc.edu (Joel Kolstad) writes:
- >In article <1993Jan23.030545.24088@netcom.com> payner@netcom.com (Rich Payne) writes:
- >>
- >>Lets say that current is a result of the applied voltage, lightening in
- >>this case. Very high voltage = very high current.
- >
- >Only if the voltage supplys's impedence is low. Those 10KV shocks you get
- >from doorknobs won't ever kill you -- honest.
-
- The thing about static charges is that you really have very few electrons.
- And since that is what current is, it should be no surprise that static
- charges cannot generate more current than they contain. Lightening is an
- extreme example, you can get large currents, but I do not think that you
- could hold a comparable charge on your body.
-
- >>Do you expect lightening to be of such high frequency that the skin
- >>effect need be considered? What exactly are we talking about?
- >
- >No, I'm just refuting your assertion that high voltages are _always_
- >dangerous. For the lay person, they might as well be, but I hope we're
- >all a little bit more educated than that around here. :-)
-
- Only if you equate high frequency with high volatge does your comment
- meet the above explanation.
-
- >I certainly agree that lightning is always dangerous.
-
- But curiously, people have survived lightening strikes.
-
- >>[static electricity] Heres a case where we have high
- >>voltage, electrons scattered mostly about the skin, and 0 HZ. The charge
- >>is static. Curiously, this is related to lightening, but not to DC and AC
- >>voltage sources.
- >
- >The charge is only static _before_ it zaps you. _As_ it zaps you, charge
- >is certainly moving.
-
- And the small static charge cannot possibly produce much current. Lightening,
- a large static charge, does produce high currents.
-
- >>Said microwaves being indistinguishable from the ones used by radar sets.
- >>You have made a distinction where there is no difference.
- >
- >I believe that there are significant physiological differences between
- >being exposed to different frequencies of microwaves, where one comes from a
- >radar dish, and the one comes from a microwave oven. (At the same power
- >level.)
-
- Those being?
-
- >It's not a good idea to stand in front of either. :-) (Assuming they're
- >not shieled, of course.)
- >
- >>Really, then why do fats heat so much faster [than water]?
- >
- >Is fat high in water content? I don't know. It's not my area of expertise.
-
- Nope.
-
- >If you want to discuss this very strained topic some more, let's take it to
- >e-mail. Thanks.
- > ---Joel Kolstad
-
-
- Or we could just drop it.
-
-
- Rich
-
- payner@netcom.com
-
-
-
-