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Tube DIY Asylum Do It Yourself (DIY) paradise for tube and SET project builders. |
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In Reply to: For AC that's I=E/Z posted by Russ57 on September 30, 2004 at 10:41:45:
You stated: "If one put a resistor in series with the anode of a valve to calculate RMS current through a transformer primary we have to remember that the valve is operating entirely with DC voltage and not AC voltage."Wouldn't it be just as valid to analyze this as a fixed DC current with AC superimposed on it? Since for output applications the AC is the important component, the DC component could be ignored assuming of course a reasonably "perfect" transformer. Thus, an ac coupled voltmeter across the "sense" resistor would provide valid measurements with regard to AC power into and out of the transformer would it not? Whether it's a true RMS meter or RMS calibrated average etc is another issue.
Where the combined AC+DC might become important is in determining the magnitude of I^2R losses in the transformer windings.
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- Re: For AC that's I=E/Z - Steve O 09/30/0419:02:46 09/30/04 (0)
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