Definitions from Wiktionary (impedance)

▸ noun:  The act of impeding; that which impedes; a hindrance.
▸ noun:  (physics) A measure of the opposition to the flow of an alternating current in a circuit; the aggregation of its resistance, and inductive and capacitive reactances; the ratio of voltage to current treated as complex quantities.
▸ noun:  (physics) A quantity analogous to electrical impedance in some other energy domain
▸ noun:  (physics, usually with “mechanical”) a measure of opposition to motion of something subjected to a force; the ratio of force to velocity treated as complex quantities.
▸ noun:  (physics, usually with “acoustic” or “sound”) the ratio of sound pressure to volume flow rate treated as complex quantities.
▸ Also see impedance





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