=== 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.