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Article #21650

Capacitor-Lost Joules

#21650
From: Vaso Bovan
Date: Tue, 06 Jun 1989 18:33
21 lines
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I am the original net poster of the "Capacitor Paradox".

As several writers have commented, this puzzle is not new. The two standard
explanations are: A) The "lost" energy is dissipated in circuit resistance ;
B) The energy is radiated away. My purpose in posting was was to get a
clarification of the two answers. In printed derivations of answer A, the
statement is generally made that energy is dissipated in circuit resistance
"independent of the value of resistance." Such derivations show a solution
with resistance in the denominator of some equation. This explanation is
intuitively incomplete, because of the behavior of the solution equation as
resistance goes to zero. Re answer B, I've never seen a complete derivation
from Maxwell's equations. I was hoping someone on the net would post or E-mail
such a derivation. All the answers I've seen here on the net and elsewhere
based on answer B have been armwaving exercises.

The puzzle was stated in terms of ideal components. As many writers have
noted, real circuits have both resistance and inductance.

Perhaps it's time now to end further net postings on this topic. If anyone
can cite detailed and complete solutions to this puzzle, especially solutions
based on Maxwell's equations, I would like to receive them by E-mail.
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Message-ID: <21145@quacky.mips.COM>
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!versatc!mips!vaso

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!apple!versatc!mips!vaso
From: vaso@mips.COM (Vaso Bovan)
Newsgroups: sci.electronics,sci.physics
Subject: Capacitor-Lost Joules
Keywords: capacitor,paradox
Message-ID: <21145@quacky.mips.COM>
Date: 6 Jun 89 18:33:47 GMT
Reply-To: vaso@mips.COM (Vaso Bovan)
Organization: MIPS Computer Systems, Sunnyvale, CA
Lines: 21