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# reactance

[ree-ak-tuh ns] /riˈæk təns/
noun
1.
Electricity. the opposition of inductance and capacitance to alternating current, expressed in ohms: equal to the product of the sine of the angular phase difference between current and voltage and the ratio of the effective voltage to the effective current. Symbol: X.
2.
Acoustics. acoustic reactance.
Origin of reactance
1890-1895
First recorded in 1890-95; react + -ance
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for reactance
Contemporary Examples
• Such a response, known in psychology as reactance, generally is short-lived.

Historical Examples
• reactance is the effect of self-induction in hindering the flow of current.

Willis Eugene Tower
• The combined effect of resistance and reactance is called impedance.

Willis Eugene Tower
• Impedance, however, does not equal the sum of resistance and reactance.

Willis Eugene Tower
• The degree to which the current is opposed by the capacity is the reactance of that capacity for that frequency.

Kempster Miller
• The degree in which any current is opposed by inductance is termed the reactance of that inductance.

Kempster Miller
• Find the reactance of a choke coil having a resistance of 10 ohms, when its impedance is 50 ohms.

Willis Eugene Tower
• The light obtainable through a reactance is not of the best quality and reactances are not much used.

Henry C. Horstmann
• If a reactance is used in place of a rheostat in an alternating-current circuit, the loss of energy is greatly reduced.

Henry C. Horstmann
• The essential parts of a Tungar Rectifier are: A bulb, transformer, reactance, and the enclosing case and equipment.

O. A. Witte
British Dictionary definitions for reactance

## reactance

/rɪˈæktəns/
noun
1.
the opposition to the flow of alternating current by the capacitance or inductance of an electrical circuit; the imaginary part of the impedance Z, Z = R + iX, where R is the resistance, i = √–1, and X is the reactance. It is expressed in ohms Compare resistance (sense 3)
2.
the opposition to the flow of an acoustic or mechanical vibration, usually due to inertia or stiffness. It is the magnitude of the imaginary part of the acoustic or mechanical impedance
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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