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An electrical network is a collection of electrical components that are linked together. An electrical circuit is a network with a closed loop that provides a current return path. Signals are linearly superimposable in linear electrical networks, which are made up entirely of sources (voltage or current), linear lumped elements (resistors, capacitors, inductors), and linear distributed elements (transmission lines). They can be more easily examined utilizing strong frequency domain techniques like Laplace transforms to derive DC, AC, and transient responses.

A resistive circuit is one in which all of the components are resistors with perfect current and voltage sources. The analysis of resistive circuits is less difficult than that of capacitor and inductor circuits. The outcome is a DC circuit if the sources are constant (DC) sources. Graph measurements and geometrical features may be used to simulate the effective resistance and current distribution properties of arbitrary resistor networks.

An electronic circuit is a network that incorporates active electronic components. Because such networks are typically nonlinear, they need more sophisticated design and analysis methods.

An active network has at least one voltage or current source that can continuously deliver energy to the network. There is no active source in a passive network.

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One or more electromotive force sources can be found in an active network. A battery or a generator are two practical examples of such sources. Active components can give power gain, inject power into the circuit, and regulate current flow within the circuit.

There are no sources of electromotive force in passive networks. They are made up of passive components such as resistors and capacitors.

If the signals in a network obey the principle of superposition, it is linear; otherwise, it is non-linear. There are some exceptions to the rule that passive networks are linear. If a big enough current is applied to an inductor with an iron core, it can be pushed into saturation. The inductor’s behavior is significantly non-linear in this area.

Because all of the resistance, capacitance, and inductance of discrete passive components (resistors, capacitors, and inductors) is presumed to be localized (“lumped”) at one location, they are referred to as lumped elements. The lumped-element model is the name given to this design philosophy, and the networks created using it are known as lumped-element circuits. This is the standard method of circuit design. Because there is a substantial percentage of a wavelength across the component dimensions at high enough frequencies or for long enough circuits (such as power transmission lines), the lumped assumption no longer holds. For such scenarios, a new design paradigm known as the distributed-element model is required. Distributed-element circuits are networks that follow this approach.