impedance

See also impédance

English [edit]

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Impedance

Wikipedia impedance (uncountable)

(physics) A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, inductive and capacitive reactance. Represented by the symbol Z.
(physics, usually with “mechanical”) a measure of opposition to motion of something subjected to a force.
(physics, usually with “acoustic” or “sound”) the sound pressure divided by the particle velocity and the surface area through which an acoustic wave propagates.
(by analogy, software engineering, usually with “mismatch”) a measure of the opposition caused by differences between two paradigms, especially between object-oriented development and relational databases
- 1997, Bhavani M. Thuraisingham, Data Management Systems: Evolution and Interoperation (ISBN 0849394937), CRC Press, page 33:
  
  Some argue that having impedance mismatch is difficult for programming intensive applications.
- 2002, Jim Melton, Advanced SQL:1999: Understanding Object-Relational and Other Advanced Features (ISBN 1558606777), Morgan Kaufmann, page 353:
  
  But the impedance mismatch between SQL and Java was no better than between SQL and other languages.
- 2004, Scott W. Ambler, The Object Primer: Agile Model-Driven Development with UML 2.0 (ISBN 1397805218), Cambridge University Press, page 442:
  
  Why does a technological impedance mismatch exist?

physics, measure of opposition to flow of current