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#11
December 7th 03, 08:04 PM
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Bill Turner wrote:
On 07 Dec 2003 18:25:51 GMT, (Avery Fineman) wrote: Write on the whiteboard 100 times: Inductance does not change with frequency...reactance changes with frequency. __________________________________________________ _______ Not true. Inductance and reactance are related by the formula XsubL = 2 pi F L. If XsubL has changed, then so has the inductance, and vice versa. How could you possibly define it otherwise? But the impedance of a coil near resonance is not well described as an XsubL. It is a combination of XsubL and XsubC, including their different phase shifts. You cannot just measure the magnitude of impedance of a coil and assume that you are measuring pure XsubL. You have to prove that this is the case by some other measurement, like the phase relationship between voltage and current. -- John Popelish |
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