ElectrodeConstraints explained

[Anders Blom]

Dear all,

there have been several questions on the Forum about the electrode constraints, in particular how they are related to the voltage drop.

To explain, finally, all the deeper aspects of the three available constraints, we have published a small presentation, that should explain why you should always use the undocumented DensityMatrix constraint if you want to compute the voltage drop, plus it sheds light on various other things related to the constraints.