Changes

=== Using Fixed-Potential PEC Objects as Voltage Sources ===

Under the static condition, every point on a PEC object has the same electric potential. By default, this is a zero potential, meaning the PEC object is "grounded". In EM.Ferma, a PEC group has a ''Fixed Potential''' property, which is expressed in Volts and has a zero default value. If you define a new PEC group and keep its default zero voltage, the objects belonging to that group will simply act as metal objects of your physical structure. However, you can define a nonzero voltage value for a PEC group. You can do in the property dialog of the PEC group, which you can access by right-clicking on the group's name in the navigation tree and selecting '''Properties...''' from the contextual menu. In the case of a nonzero voltage, all the PEC objects belonging to that group effectively turn into voltage sources. For example, two parallel PEC plates, one with a zero potential and the other with a nonzero potential represent a simple air-filled capacitor. Note that the voltage value can be positive or negative.

=== Wire Current Sources ===