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From: seifert@mako.UUCP (Snoopy)
Newsgroups: net.cooks
Subject: Re: micro-wave oven question
Message-ID: <564@mako.UUCP>
Date: Fri, 1-Feb-85 09:45:37 EST
Article-I.D.: mako.564
Posted: Fri Feb  1 09:45:37 1985
Date-Received: Sun, 3-Feb-85 05:42:11 EST
References: <285@imsvax.UUCP> <119@rtech.ARPA>
Reply-To: seifert@mako.UUCP (Snoopy)
Organization: The Daisy Hill Puppy Farm
Lines: 37
Keywords: microwaves resistors Ohm's law
Summary: Snoopy is amased to find that Ohm's law has been repealed!

In article <119@rtech.ARPA> jeff@rtech.ARPA (Jeff Lichtman) writes:

>   Food is a poor conductor, so it doesn't place much of a load on the
> oven.  The effect is like putting a high resistance across a light
> socket; the resistor will get hot, but you won't blow a fuse, because
> the resistor won't draw much current.
> Metals are very good conductors, so putting metal in a microwave oven is like
> shorting out a light socket; it can burn out the source (if the metal doesn't
> burn up first).
>
> I'm not sure how metal racks and other metal microwave accessories work. It's
> possible that the food shields the rack from the source of the microwaves.
>-- 
>Jeff Lichtman at rtech (Relational Technology, Inc.)
>aka Swazoo Koolak

Perhaps you could enlighten me, when was Ohm's law repealed?
I assume that rtech hired you for software or some such rather than
your extensive knowledge <cough> of electrical and thermal systems.

Metal reflects microwaves.  Food absorbs microwaves.  The microwave
energy is transformed into heat energy.  V=IR  P=VI  F=MA  Whether
the resistor gets hot or not depends on the heat dissipation verses
the amount of power, not on whether the resistor is a high value or a
low value.  The current does affect the power (P=VI), but some
resistors can dissipate a lot of power without getting hot, while
others can't, hence the "power rating" of a resister.

Further discussion in net.analog or some such place, please.
(you too can compare capacitors with batteries!)

I promise to someday post my pizza recipe.
        _____
        |___|		the Bavarian Beagle
       _|___|_			Snoopy
       \_____/		tektronix!mako!seifert
        \___/