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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Re: APM & Electronics 101, addendum posted by Allan Moyse on June 17, 2000 at 21:02:37:
Allan Moyse wrote:We know there is some capacitance between the two wires in the "pigtail" outside the ferrite. For an A/C potential (voltage) applied across the device, that capacitance will "conduct" more and more as the freqency of the signal inceases. For a DC signal, no current will flow (steady state), but for very high freqency signals, some current will flow. The 110 V, 60 hz, AC in the wall will certainly not flow through this pitifully small capacitance since it's freqency is so low. However, our wall current is not perfect. I belive that high-freqency RF noise which is present in our AC might flow through this capacitance. And that current will cause a magnetic field. This magnetic field will induce a current in the wire in the opposite direction as the current which is creating it (due to the ferrite coupling)--which will impede the current flow.
Yes, I'd mentioned the capacitance due to the zip cord some time back. And someone has already claimed they measured it at 118 pF for the zip cord alone and 125 pF for the complete unit. So yes, it does essentially add a bit of capacitance between the hot and neutral AC lines where it's plugged in.
However there is already capacitance between the hot and neutral AC lines throughout their entire length even without the "tweak." So I fail to see that adding 125 pF across the AC line at one particular point can make any real difference in either the lumped or distributed capacitance of the cable that's already in the AC line.
In search of the truth...
Careful. That can get you into trouble with the priesthood. :-)
se
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Follow Ups
- Re: APM & Electronics 101, addendum - Steve Eddy 21:28:56 06/17/00 (1)
- Re: APM & Electronics 101, addendum - Pete Fleming 03:58:35 06/18/00 (0)
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