=== Voltage Sources ===
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[[Image:vsource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
In EM.Ferma, Voltage Sources are applied to a specified PEC group that exists under Physical Structure in EM.CUBE's navigation tree. All CAD objects under the specified PEC group will act as Voltage Sources.
=== Charge Sources ===
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[[Image:qsource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
Charge Sources in EM.Ferma apply a charge (or charge density) to a region defined by any of EM.CUBE's CAD objects.
=== Current Sources ===
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[[Image:isource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
Current Sources in EM.Ferma apply a specified current to any number of one-dimensional CAD objects, such as Lines, Polylines, or Spirals. For any curve, such as a Parabola or a Circle, the user will be prompted to perform a one-time conversion to a Polyline just before running a simulation.
Adding a new Current Source is very similar to adding a new Charge Source. Keep in mind only one-dimensional objects can be drawn under this material group.
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<gallery caption="Sample gallery" widths="100px" heights="100px" perrow="6">
[[Image:vsource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
[[Image:qsource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
[[Image:isource.png|thumb|200px|EM.Ferma's Voltage Source Dialog]]
</gallery>
== Domain and Boundary Conditions ==