Impedance

Impedance is the complex-valued generalization of resistance. It may refer to:

• Acoustic impedance, a constant related to the propagation of sound waves in an acoustic medium
• Electrical impedance, the ratio of the voltage phasor to the electric current phasor, a measure of the opposition to time-varying electric current in an electric circuit
  • High impedance, when only a small amount of current is allowed through
  • Characteristic impedance of a transmission line
  • Impedance (accelerator physics), a characterization of the self interaction of a charged particle beam
  • Nominal impedance, approximate designed impedance
  • Impedance matching, the adjustment of input impedance and output impedance
• Mechanical impedance, a measure of opposition to motion of a structure subjected to a force
• Wave impedance, a constant related to electromagnetic wave propagation in a medium
  • Impedance of free space, a universal constant and the simplest case of a wave impedance

See also

• All pages with titles beginning with impedance
• All pages with titles containing impedance

1. Electrical impedance
2. Characteristic impedance
3. Impedance matching
4. Input impedance
5. High impedance
6. Output impedance
7. Wave impedance
8. Impedance control
9. Acoustic impedance
10. Quarter-wave impedance transformer
11. Mechanical impedance
12. Smith chart
13. Bioelectrical impedance analysis
14. Impedance of free space
15. Nominal impedance
16. Antenna (radio)
17. Transmission line
18. Impedance cardiography
19. Impedance bridging
20. Impedance parameters