url: http://escribe.com/health/thesilverlist/m60718.html From: jrowland (view other messages by this author) Date: Thu, 26 Jun 2003 00:11:51
> http://escribe.com/health/thesilverlist/m60705.html Thanks, Dan; I'm still waiting for this one to be resolved, which mysteriously entered a state of suspended animation: > ...But the fact remains. The circuit presents a > constant impedance > between the variac and the silver cell... > > A simple 5 cent resistor would do exactly the same > thing. Please explain how a "resistor" can have "impedance" which is strictly a quality of inductance? Best Regards HDN http://escribe.com/health/thesilverlist/m59322.html 5/22/03 jr ---------------------------------------------------------------------- This is basic ac circuit analysis. Resistance is defined only at DC. At any other frequency, you talk about the impedance of a circuit. This is determined by the reactance of the circuit elements, where Inductive reactance: XL = 2 * pi * F * L Capacitive reactance: XC = 1 / (2 * pi * F * C) Thus, the impedance of a RLC circuit is a function of frequency. There are many ways of defining resonance. One of them is the frequency where XL = XC. Then 2 * pi * F * L = 1 / (2 * pi * F * C) (2 * pi * F * L) * (2 * pi * F * C) = 1 4 * pi^2 * F^2 * L * C = 1 F^2 = 1 / (4 * pi^2 * L * C) Take the square root of both sides: F = 1 / (2 * pi * sqrt(LC)) Thus at resonance, the reactances cancel and the resulting circuit impedance is purely resistive. He operates at resonance, and a linear circuit is not affected by amplitude. Hence his LRC circuit can be replaced with a single resistor. There are many excellent tutorials on the web. Just search for ac circuit analysis. Stuff like this belongs on the off-topic list. Best Regards, Mike Monett -- The silver-list is a moderated forum for discussion of colloidal silver. Instructions for unsubscribing may be found at: http://silverlist.org To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
