Circuit boards containing discrete transistors and various passive components.

A helical resonator is a passive electrical component that can be used as a filter.

In newer equipment, most passive components come in surface mount packages.

Butterworth's filter becomes a non-trivial example when it is implemented entirely with passive components.

A capacitor (originally known as condenser) is a passive two-terminal electrical component used to store energy in an electric field.

In control systems and circuit network theory, a passive component or circuit is one that consumes energy, but does not produce energy.

In circuit design, informally, passive components refer to ones that are not capable of power gain; this means they cannot amplify signals.

It separates the wavelengths using passive optical components such as bandpass filters and prisms.

Storages and channels are passive components which store or transmit information.

Alternatively, passive components can be utilised to construct filter circuits before the amplifier.