An active network is a network that contains an active source – either a [[voltage source]] or [[current source]].
A passive network is a network that does not contain an active source.
An active network contains one or more sources of [[electromotive force]]. It consists of active elements like a battery or a transistor. Active elements can inject power to the circuit, provide power gain, and control the current flow within the circuit.
Passive networks do not contain any sources of emf. They consist of passive elements like resistors and capacitors. These elements are not capable of the same functions as active elements.
A network is linear if its signals obey the principle of [[Superposition theorem|superposition]]; otherwise it is non-linear.
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