Theoretical background of applied electrodynamics

In the internet one can find thousands of Tesla-coil and other "high-voltage pages". In general the creators want to show what maschines they have built and what technical details are important. On this site I only want to present some important equations in electrodynamics, which are essential to create improvements on the projects presented on The most important background knowledge is to understand the Maxwell-equations, which describe the relationship of current-distributions, magnetic fields, electric fields and charge distributions. If you don´t understand the formulas presented here, it doesn´t matter. You can learn this things on Wikipedia:

Electrodynamic equations
Electrodynanmic equations 2