# Meaning of impedance in English:

## impedance

### noun

• The effective resistance of an electric circuit or component to alternating current, arising from the combined effects of ohmic resistance and reactance.

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

‘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.’
• ‘If the load impedance is not equal to the transmission line impedance, the wattmeter will indicate the amount of reflected power.’
• ‘As the signal propagates down a path, the voltage magnitude is related to the effective impedance up to the point in the signal's flight.’
• ‘Figure 3 shows the display when the cable is terminated in its characteristic impedance of 50 ohms.’
• ‘Each antenna features vertical polarization, with an impedance of 50 ohms.’
• ‘The instrument must show the true rms value of the voltage across the measuring impedance.’
• ‘Electrical impedance spectroscopy is a method for studying the structure of organic and inorganic materials.’
• ‘This greatly minimizes crosstalk among signals and helps to balance the effective impedance of each line at high frequencies.’
• ‘In contrast, the configurations and sizes of the nozzles of the first and the second head members are identical, and their impedances are also the same.’
• ‘A high impedance probe for the spectrum analyzer is essential.’
• ‘Electric impedance tomography is a new imaging technique that is potentially capable of monitoring those imbalances.’
• ‘Note that impedance and reactance are both given in units of ‘ohms’ just like resistance.’
• ‘Will the electric impedance tomography technique be improved further?’
• ‘It may be expressed as IX, where X, the reactance, is the imaginary part of the impedance.’
• ‘This was because the coupling resistance value had inverse effects on the amount of current arriving and on the impedance of the neurite.’
• ‘The technique is based on the principle that lean tissue has a higher electrical conductivity and a lower impedance rate than fat.’
• ‘When impedance is reached, the energy shuts off and a tone alerts OR staff members that fusion is complete.’
• ‘The passive antenna elements are coupled to selectable impedance components.’