Editing Electrical network (section)

===By passivity===
An active network contains at least one [[voltage source]] or [[current source]] that can supply energy to the network indefinitely. A [[Passivity (engineering)|passive]] network  does not contain an active source.

An active network contains one or more sources of [[electromotive force]]. Practical examples of such sources include a [[Electric battery|battery]] or a [[Electric generator|generator]]. 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 electromotive force. They consist of passive elements like resistors and capacitors.