Charge Conservation - Hint of the Day
in [Design]
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From: Grant on 21 Jul 2010 18:39 On Wed, 21 Jul 2010 07:05:47 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Wed, 21 Jul 2010 07:51:08 -0500, "George Jefferson" ><phreon111(a)gmail.com> wrote: > >> >> >>"Jim Thompson" <To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote in >>message news:jqfb469iggbg6dkeu84c8kgp3m9g0alr3m(a)4ax.com... >>> Charge Conservation - Hint of the Day: >>> >>> How many Coulombs can a 1mH inductor charged to 1A deliver? >>> >>> >> >>Charged to 1A? hahaha, are you serious? Do you mean 1A flowing through it >>after steady state has been reached? >> >> > >Steady-state doesn't matter but sure, why not? It's common to talk >about charging an inductor, namely connecting a voltage to it and >allowing it to integrate up a current. > >Those are just shorthand words that EEs use; so quibble all you want. >What matters is that we get the numbers right. Go turn on your >television or start your car. Do they work? Oh gawd, the number of non-technical people I've met who want to consider engineering a 'soft' discipline, like a belief system :) Had a wonderful argument once with a lady about her 'faulty' photocopier, she regularly emptied and filled the toner overflow container, and was wondering why the copies kept getting fainter and fainter... Yet after a service call, the copier worked fine! I discovered her error by asking to watch how she added the toner, then the penny dropped -- yet the instructions for adding toner were printed right there under the lid of the copier. Often I 'fix' things simply by following the instructions ;) Same with electronics design, one gets amazing results by following the datasheet and applications notes -- then bending the circuit to meet requirements. So yeah, working with a vague query means you get to make up the ground rules in your response, hopefully in a way that lets others follow your reasoning and therefore able to duplicate your results, or point out any flaw in reasoning -- basic scientific method, we follow certain rules that can be verified by experiment -- hard evidence vs some belief system. Even if one argues some of the tools are belief systems (valid until proven wrong), the models we use at least work close enough to reality to be useful. It's the playing with magic smoke :o) Dance of the universe. I know one can charge an inductor, look at the lovely sparks one may produce with them! Replying to Jan, too. Philosophical. Grant.
From: Phil Hobbs on 21 Jul 2010 19:15 Richard Henry wrote: > On Jul 20, 8:24 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)On-My- > Web-Site.com> wrote: >> Charge Conservation - Hint of the Day: >> >> How many Coulombs can a 1mH inductor charged to 1A deliver? > > Into what? What a complete waste of bandwidth. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal ElectroOptical Innovations 55 Orchard Rd Briarcliff Manor NY 10510 845-480-2058 hobbs at electrooptical dot net http://electrooptical.net
From: Jim Thompson on 21 Jul 2010 20:02 On Wed, 21 Jul 2010 12:54:27 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Wed, 21 Jul 2010 18:24:04 GMT, Jan Panteltje ><pNaonStpealmtje(a)yahoo.com> wrote: > >>On a sunny day (Wed, 21 Jul 2010 10:15:51 -0700) it happened Jim Thompson >><To-Email-Use-The-Envelope-Icon(a)On-My-Web-Site.com> wrote in >><mmae46l331ve7p3u2982r00emjlf359ib1(a)4ax.com>: >> >>>On Wed, 21 Jul 2010 09:52:25 -0700, John Larkin >>><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >>> >>>[snip] >>>> >>>>The numbers work. Engineering is about what works. >>>> >>>>John >>> >>>Engineering is about what works _all_the_time_, under >>>_all_environmental_conditions_. >> >>Bull. >>You mean 'specified conditions'. >>'All ...' would mean also when the sun burns out. >>Clue, clue clue >>Where is yours? > >Am I to suppose all of his linear ICs will work at liquid helium >temperatures, or at 350C? > >John At specification temperatures, you pimp. Actually some of my designs do work "down-hole". Schlumberger loves me :-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Only as good as the person behind the wheel.
From: Jim Thompson on 21 Jul 2010 20:03 On Wed, 21 Jul 2010 19:15:24 -0400, Phil Hobbs <pcdhSpamMeSenseless(a)electrooptical.net> wrote: >Richard Henry wrote: >> On Jul 20, 8:24 am, Jim Thompson <To-Email-Use-The-Envelope-I...(a)On-My- >> Web-Site.com> wrote: >>> Charge Conservation - Hint of the Day: >>> >>> How many Coulombs can a 1mH inductor charged to 1A deliver? >> >> Into what? > >What a complete waste of bandwidth. > >Cheers > >Phil Hobbs Are you a supplicant ?:-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Only as good as the person behind the wheel.
From: Sylvia Else on 21 Jul 2010 20:58
On 21/07/2010 1:24 AM, Jim Thompson wrote: > Charge Conservation - Hint of the Day: > > How many Coulombs can a 1mH inductor charged to 1A deliver? > > ...Jim Thompso Looks like an energy conservation issue rather than charge conservation, unless the answer is meant to be zero as suggested by one respondent. Stick a capacitor across the inductor and the charge passed through the capacitor will depend on its capacitance, as will the potential difference obtained. However, the total energy transferred to the capacitor (at the point where the current drops to zero) will be a constant. Sylvia. |