Active and Passive ElementsElectric Circuits consist of two basic types of elements. These are the active elements and the passive elements.
An active element is capable of generating electrical energy.
A passive element is one which does not generate electricity but either consumes it or stores it. Resistors, Inductors and Capacitors are simple passive elements. Diodes, transistors etc. are also passive elements.
Linear Element A circuit/network element is linear if the relation between current and voltage involves a constant coefficient.
Bilateral System In a bilateral system, the same relationship between current and voltage exists for current flowing in either direction. On the other hand, a unilateral system has different current-voltage relationships for the two possible directions of current, as in diode.
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