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To: Petz who wrote (5861)	4/29/1998 11:11:00 PM
From: Time Traveler	Respond to of 6843

Petz, I am going to touch on the following subject just one more time. For practicality, that means in engineering, a + b = a if a >> b PERIOD Now, let's go on to the next irrelevant subject you and I have both raised. The proper term for "AC resistance" is AC resistance. Resistance is a subset of impedance. Impedance without resistance does not dissipate any power. There are devices out there when you crank up the AC signal, it starts to heat up! This is AC resistance at work in which the DC signal does not see. One example is a transformer. When you apply DC current, only the copper resistance heats up, but when you apply an AC voltage, the core of the transformer starts to heat up as well. As a system engineer, don't you work with switching power supplies? Time Traveler