# reactance

[ree-ak-tuh ns]

- 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: XCompare capacitive reactance, inductive reactance.
- Acoustics. acoustic reactance.

## Origin of reactance^{}

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Examples from the Web for reactance

### Contemporary Examples

### Historical Examples

#### The combined effect of resistance and reactance is called impedance.

PhysicsWillis Eugene Tower

#### Reactance is the effect of self-induction in hindering the flow of current.

PhysicsWillis Eugene Tower

#### Impedance, however, does not equal the sum of resistance and reactance.

PhysicsWillis Eugene Tower

#### The degree to which the current is opposed by the capacity is the reactance of that capacity for that frequency.

Cyclopedia of Telephony & Telegraphy Vol. 1Kempster Miller

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

Cyclopedia of Telephony & Telegraphy Vol. 1Kempster Miller

# reactance

- 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 + i X, where R is the resistance, i = √–1, and X is the reactance. It is expressed in ohmsCompare resistance (def. 3)
- 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

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