Recent content by G Cooke

This is true; however, if Q is designed very large, and assuming that there is in fact no specific effect on coupling due to motion, then it follows from equation 9 that: In the case of central source resonators, there would be no need to excavate roads. Thus, the size of the infrastructure...

Thanks for your reply, Sophie. I have a few questions. 1) Why would the infrastructure for contactless power transmission be expensive? I'm imagining the resonator circuit shown in the document being duplicated as needed, along with meters. I don't immediately see anything there I would think...

This is one of very few in-depth sources of information I can find online about Highly Coupled Magnetic Resonance...

Sorry! Especially disregard that sequence divergence statement. I realized afterwards it's incorrect in many different ways. Probably should have it deleted so it doesn't confuse everybody who comes across this thread... Right. I just blindly applied the electrostatics concept of charge...

I see. So somehow it is necessarily true that the electric field from the conductor's new positive charge will drain the kinetic energy of the photoelectron before that positive charge can distribute around the inner surface of the shell. Interesting. Actually, now that I think about it, I...

So I realize now that energy is conserved because φ includes the post-ejection electric potential energy Efin of the the conductor, which it must because the newly ejected photoelectron is caught inside the electric field from the now positively charged conductor and must overcome its force in...

I see. But actually, my math is 19 orders of magnitude off because I forgot that φ will be in units of Joules rather than eV here. So I guess this makes the sphere 6 orders of magnitude larger than a proton. Still impossible, I presume? Interesting. I was actually just about to type that this...

I'm not so sure about that. To make Eprod > φ, algebra says all we need is C < Q2elec/φ, which is about 1e-38F...pretty small, but impossible? Could you elaborate on this?

That is true; however, even if we assume zero initial charge, there appears to be a problem. With Qinit = 0, we have φ at its base value (i.e., no stopping potential) and Eprod = Efin - Einit = Q2elec/C - 0. So φ is a constant, and Eprod depends on C, which is arbitrary. Thus, it is possible...

I'm having trouble seeing how electric potential energy production on a conductor follows conservation of energy. Let's use the photoelectric effect as an example. A photon with energy E = hν strikes a conductor, ejecting a photoelectron with a maximum kinetic energy of hν - φ. Assuming the...

Ok, you can close it now. I got what I needed out of it.

Interesting. Could you explain where the 1240 came from? I appreciate the many interesting facts and useful suggestions you've provided.

So I looked up the driven guard here: http://www.keysight.com/upload/cmc_upload/All/2-Parametric_Measurement_Basic.pdf?&cc=US&lc=eng and I see that it reduces effective parasitic capacitance in a triaxial cable by isolating the signal line from the shield. This would seem not very effective...

Actually, using the exact numbers from my calculations, the charge will be the exact charge of an electron. To be specific, 5V*32.04zF=1.602E-19C. I'll take a look into this "driven guard." Yes, it's interesting lol. I don't know, maybe surface mount? That's a very interesting article...

Hi Nidum, Yes, a zF self-capacitance is necessary to satisfy multiple conditions in order to make it possible to prototype a certain apparatus.