Inductive reactance

Definition

Inductive reactance is the opposition to the change in current by an inductor in an AC circuit. It is measured in ohms and increases with both frequency and inductance.

5 Must Know Facts For Your Next Test

1. Inductive reactance ($X_L$) is calculated using the formula $X_L = 2\pi f L$, where $f$ is the frequency and $L$ is the inductance.
2. As frequency increases, inductive reactance also increases.
3. Inductive reactance causes a phase shift where the current lags behind the voltage by 90 degrees.
4. It only affects alternating current (AC) circuits, not direct current (DC) circuits.
5. The unit of measurement for inductive reactance is ohms ($\Omega$).

Review Questions

• How does inductive reactance vary with frequency?
• What is the phase relationship between current and voltage in a circuit with high inductive reactance?
• What formula is used to calculate inductive reactance?

Related terms

Capacitive Reactance: The opposition to the change in voltage by a capacitor in an AC circuit, measured in ohms.

Impedance: The total opposition to current flow in an AC circuit, composed of resistance and reactance.

Reactance: The part of impedance that represents opposition to changes in current or voltage due to capacitances or inductances.