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Re: Time to ask and learn

I would think that in either case if a humbalance were used that there would be a specific setting where the currents would need to be equal. I suspect in the case of DC, the point at which this happens would not be the result of a perfect match between the two resistances on either side of the ground reference.

I think the issue of confusion here is how we need to look at the filament. For a 5V dc filament with a 5 ohm resistance I imagine 5 one ohm resistor in series with each other. At each junction the voltage will change by 1V hence the bias will change by that amount. This means that the +1V section will have more bias and draw less current than the +5V section. This shifts the "symmetry" of the filament away from the geometric center thus making more current exit from one side of the filament than the other. By using a par of mismatched resistors to form a ground reference I would expect the balance could be restored (the positive end of the filament would need a smaller value).

as for the magnitude of these difference in reality, i have no idea.

Think of why an AC filament doesn't always null wiht equal resistances forming the ground reference. Due to the reversal of bias, this should be the case.

dave

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