>The wall was because I could never couldn’t develop an intuition for the physics behind it. On the off chance that you can understand German, check out chapte

>The wall was because I could never couldn’t develop an intuition for the physics behind it. On the off chance that you can understand German, check out chapter 9.1.1 Fluidvolumen und Divergenz (until and including chapter 11 Erhaltung der Energie), in the book Einführung Theoretische Meteorologie by Michael Hantel (ISBN 978-3-8274-3055-7). It even uses a car analogy ;) You will understand fluid dynamics, and by extension electrodynamics, like you never did before. And it will teach you the physical intuition first. This book was such a lucky find for me ten years ago. Equation (11.3) is the fluid analogon to the continuity equation (in electrodynamics that is: ∂/∂t ρ + ∇⃗⋅J⃗ = 0)--and you can see how, physically, you get to it, and what the parts and the whole mean. Lots of diagrams and geometry and simple analogies make that take about 30 pages.