The main issue is that you cannot just put a voltmeter or other devices/methods near a BH. Not that you can't do it in a Gedankenexperiment way, of course, but in a relativistic way. Because of General & Special Relativity, things like volts and amps, charge and mass, they get 'bent' in this weird non-intuitive way. In our own (slow) world, electro-magnetism is one of those 'weird things' that comes out of special relativity [0] for example. So, trying to take our 'classical' world and apply it to a General Relativistic world is going to have 'weird' results.
There is a TON of work done on BHs and the formulations to try to bend our knowledge of QM and 'classical' physics to them. If you really want to get into the nitty gritty of it start with this [1]. It's a HARD road, but the proofs and knowledge in the field is mindblowingly cool. Go for it!
There is a TON of work done on BHs and the formulations to try to bend our knowledge of QM and 'classical' physics to them. If you really want to get into the nitty gritty of it start with this [1]. It's a HARD road, but the proofs and knowledge in the field is mindblowingly cool. Go for it!
[0]https://en.wikipedia.org/wiki/Relativistic_electromagnetism
[1]https://www.amazon.com/Classical-Electrodynamics-Third-David...