Watching this video lecture of Peter Higgs https://youtu.be/QtudlGHoBQ8?t=372, he says (roughly) at one point that Paul Dirac applied quantum mechanics to Maxwell's field equations and deduced the existence of photons (previously predicted by Einstein in the photoelectric effect?). Question. Mat...

I just learned about the basics of transformers. I am aware that according to the law of energy conservation, power input should be equal to power output. However, when I think about this with ohm's law, in the secondary coil, power remains the same but voltage is increased implies resistance is ...