Thanks for popping in. As always,I highly respect your thoughts and clear-headedness from past discussions, and say "thank you" for the insights. I hope you can shed more light on the discussion.Hi, just popping my head up when I really should not be spending time on the intarwebs
I am perfectly fine with limiting the issues I am discussing to DC. No problem there.Strictly speaking, Ohm's law applies to DC systems, not AC systems. The concept of Ohm's law has been extended to AC, by adding terms for things such as inductance and capacitance, but the original concept put forth by Ohm himself was DC.
I can't dispute that. Ohm's law would say that the current is undefined.For what its worth, the 'continuous loop of superconducting wire' is regularly used in industry, and to the best ability to measure, V and R are zero, and I has a finite non-zero value. The practical application is the superconducting magnet, for example used in NMR and particle accelerators.
With the switch open, a power supply applies a voltage to the terminals. Even though this is a loop of superconductor, the applied voltage results in a finite current; the loop of wire (usually many turns) is an inductor, thus an applied voltage results a finite and continuously changing current flow. This is a very low frequency AC effect. Once the current has ramped up to the desired value, the shorting switch is closed, and the power supply simply disconnected.
Once the switch is closed, the system is DC, with no voltage drop anywhere, no resistance anywhere, a finite current flow, and a constant magnetic field.
Seems to me that if the superconductor magnetic field is being used to do work, then there would be an "impedance" acting on the electrons in the loop. Energy would have to be added to the circuit to maintain whatever work the magnetic field is doing. So, if we are deriving "work" from the magnetic field, we would have to be adding energy into the system, if not continuously, then at least on occasion. The amount of work being done could possibly be very small considering that we are pushing around individual atomic particles. But, when we take into account that the speeds are relativistic, the energy required would be massive.There are dissipation mechanisms (resistance) for AC current flow, and theories suggest some dissipation mechanisms for DC, which would mean very low resistance rather than true zero resistance...but the resistance is so low that it would take tens thousands of years for the current to decay, if not much longer.
Obviously I don't know anything about the above. It all seems very strange. I'm going to go out on a limb and say that massive amounts of energy are being routed into the super-collider system to make the atomic particles move at relativistic speeds. The superconductor magnet is not some kind of magic panacea to create energy out of nothing. My guess is that the superconductors are being used to increase the efficiency from the massive amount of power used.... not that current can flow in the loop with no voltage applied. I guess some research is in order.