Device Modeling and Circuit Elements
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This chapter discusses a device-independent black-box approach to model a broad variety of physical devices. For the purpose of network theory, a circuit element can be considered as a black-box, whose electrical behavior is defined in terms of a mathematical model (i.e., a set of algebraic and/or differential and/or integral equations), relating currents and voltages at various terminals of the device. The physical means required to implement the black-box are irrelevant. The circuit element is therefore an ideal entity, corresponding to the best abstraction and to the most suited description of a physical device.