Passive component A passive component may be a module that doesn't need energy to control, apart from the offered alternating current (AC) circuit that it's connected to. A passive module isn't capable of power gain and isn't a source of energy. A typical passive component would be a chassis, inductor, resistor, transformer, or capacitor. Generally, passive components aren't able to increase the ability of an indication nor are they able to amplify it. However, they'll increase current or voltage by an LC circuit that stores electricity from resonant frequencies or by a transformer that acts like an electrical isolator. Passive devices may be used separately or connected along inside a circuit, either in a series or in a parallel combination to control complex circuits or signals, produce a phase shift to the signal or to supply some kind of feedback however they can not multiply an indication by more than one because they have no power gain. In the ...