Passive components, or Passive Parts can’t introduce net energy into the circuit. They also can’t rely on a source of power, except for what is available from the (AC) circuit they are connected to. As a consequence they can’t amplify (increase the power of a signal), although they may increase a voltage or current (such as is done by a transformer or resonant circuit). Passive components include two-terminal components such as
- Resistors
- Capacitors
- Magnetic Devices (like Inductors, transformer, Magnetic Amplifier, Ferrite Impedances, Beads, Motor / Generator, Solenoid, Loudspeaker and microphone)
- Memristor
- Networks
- Transducers, Sensors, Detectors
- Antennas
- Assemblies, Modules
- Prototyping Aids
Also see Active Components and Electromechanical Components.