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re: arc furnace heating effect: max power theorem
28 jul 2001
>rod speed wrote:
>>...the original claim that you get the maximum power dissipated
>>in the kettle element when the mains source impedance matches
>>the kettle element impedance is just plain wrong.
no. that is plainly correct.
>>in that situation you will get less power in the kettle element
>>than with the mains source impedances seen in real life.
>you appear to be saying that the kettle dissipates less power when
>its impedance equals the mains impedance than when its impedance
>is more than the mains impedance...
or maybe you think the kettle dissipates less power when its
impedance equals the mains impedance than when its impedance
is less than the mains impedance...
if the 240 v mains impedance were 0.01 ohms and the kettle impedance
were 0.01 ohms, 240/0.02 = 12k amps would flow, and the kettle would
dissipate 0.01x12k^2 = 1440 kw. lower the kettle impedance to 0.001
ohms, and 240/.011 = 21.8k amps flow, and the kettle only dissipates
0.001x21.8k^2 = 476 kw...
looks like you are still wrong :-)
nick
nicholson l. pine system design and consulting
pine associates, ltd. (610) 489-1475/0545
821 collegeville road fax: (610) 489-7057
collegeville, pa 19426 email: nick@ece.vill.edu
computer simulation and modeling. high performance, low cost, solar heating
and cogeneration system design. bsee, msee. senior member, ieee. registered
us patent agent. web site: http://www.ece.vill.edu/~nick
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