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Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
Plasma wrote ...
I measure the ac voltage and subtract it from the dc voltage. How would you minimise the leakage current, would that be apart of the ac part. I got it wrong before, stacking the same charge plates together increase the voltage registered.
Yes, stacking same charge plates together will raise the voltage measured with respect to ground, but the charge will stay the same. By stacking plates together, you're reducing the capacitance to ground, which will icnrease the voltage. Think of it as one plate shielding the other's 'path' to ground on one side.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
I've been trying some things, but I've run into problems, if I connect two plates that are separate from sideways, and connect a 9volt battery, when I place two sheets above these two and messaure the voltage, it is very low. I can't seem to understand this, any idea, cheers
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
The rate of discharge from a charged plate is still, in the 21st century, one of the standard ways of detecting and measuring very low energy X-rays <5keV.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
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Posts: 304
All these experiments with parallel plate air spaced capacitors (also when introducing "charged" dielectrics into the space between the plates) should be done with extremely good insolation against ground and all the DC voltages should be measured by using electrostatic voltmeters to get reliable and correct results.
Here is an example for a parallel plate capacitor with good insolation, only one plate:
Here is an example for a swiss high quality electrostatic voltmeter up to 250 V:
Once charged, the voltage remains almost unchanged for many hours.
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
I'm getting slightly confused here, we all know capacitors store energy in the dielectric, not the plates, and the dielectrics we're discussion here are all much better dielectrics than 'free space'.
Also, it's the dielectric used in tuned lenth transmission lines that determine the speed of light within the various mediums discussed.
Registered Member #61406
Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
Thanks physfan, I noticed that if I use a ruler and rub it against my hair, I get different results than what a battery does, I ended up cutting a template and was planning on having two plates 180 degrees and then spinning that between two other plates, it would have made ac at about 40hz
Registered Member #19
Joined: Thu Feb 02 2006, 03:19PM
Location: Jacksonville, FL
Posts: 168
I'm getting slightly confused here, we all know capacitors store energy in the dielectric, not the plates, and the dielectrics we're discussion here are all much better dielectrics than 'free space'.
I believe the charge *is* on the plates since charge cannot move through a dielectric? When you apply a voltage across the capacitor, the electrons of the dielectric atoms spend more of their time near the positive plate which leaves the positive nucleus closer to the negative plate? This in turn causes electrons to bunch up at the negative capacitor plate charging it.
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Electrical charges on plates
