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R-L-C AND HARMONICS


nalen
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Hi Nalen,
Please think about it.

Parallel Resonance.
Don't you think that a parallel resonant circuit is supposed to be a high resistance at resonance?
What happens to it and its attenuation of harmonics if it had a low resistance across it?

Series Resonance.
Don't you think that a series resonant circuit is supposed to be a low resistance at resonance?
What happens to it and its attenuation of harmonics if it had a high resistance in series with it?
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Hi Alun,
Electricity is cheap over here because it "comes out of the ground" at Niagara Falls. So we don't bother correcting the power factor on little things.

Our florescent ballasts are just a big inductor with a filament winding for each end of the tube. They don't use a starter circuit, the tube heats in a second, then it flickers a little and lights. The filaments in the tubes are the 1st thing to fail, then the lamp doesn't light. Near the filaments the glass turns black.
Since the filaments waste a lot of power and fail early, these florescent lights are being phased-out, and new ones will use electronics to start the tube, like little compact florescent bulbs do now. ;D

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Our florescent ballasts are just a big inductor with a filament winding for each end of the tube. T

What you've just described isn't just a simple inductor, while this may be the case for small tubes it's impossible for larger ones as the striking voltage even with the fillaments warm is considerably higher than 168V, it's an auto transformer with taps in the coil for the filaments.
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