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Capacitor Device

The *cap* device is a two-terminal capacitor. Typically, a *value* property is added to specify capacitance. Alternatively, a
*model* property can be added to specify a capacitor model. If a
*model* property is assigned, then a *param* property can be
used to supply the geometric parameters. In either case, the *param* property can be used to provide initial conditions.

The `+
' symbol in the representation accesses a *branch*
property that returns a hypertext expression consisting of the
capacitance value times the time-derivative of the voltage across the
capacitor, yielding the capacitor current.

Stephen R. Whiteley
2019-11-22