The effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance. See also acoustic impedance.
- Impedance is usually expressed as a complex quantity Z = R + jX, where R is resistance, X is reactance, and j is the imaginary square root of 1
More example sentences
- The constant impedance is maintained despite changes in temperature and voltage by using two external resistors to hold the impedances for all the I / O pins, which can number hundreds in the larger parts.
- An impedance matching circuit is provided for each signal-carrying wire pair of the first and second wire pair sets.
- The transponder alters the impedance of the tuned circuit in accordance with the coded pattern.
Impedance is a specialized electrical term (as defined above), while impediment is an everyday term meaning ‘a hindrance or obstruction’: a low-impedance power supply; interpreting his handwriting was an impediment to getting business done.
Definition of impedance in:
- The British & World English dictionary