Impedance

usgb/ɪmˈpiːdns/
noun

The measure of the opposition that a circuit presents to a current when a voltage is applied.

The total impedance of this circuit is 120 ohms.
Visual representation of "impedance" - The measure of the opposition that a circuit presents to a current when a voltage is applied.

Often appears as...

  • electrical impedance
  • impedance matching

Usage tips

Technical

Definition 1 of 2
Visual representation of "impedance"
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Technical Term

Impedance is specific to electronics and physics, used in professional or educational settings.

Illustration for Technical Term
The lecturer explained that impedance affects how electronic signals travel in a circuit.
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Not Just Resistance

Impedance includes resistance and reactance (AC circuits), it's more complex than just resisting current.

Illustration for Not Just Resistance
In AC circuits, the impedance considers both the resistive and reactive components.
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Unit of Measurement

Impedance is measured in ohms, symbolized by the Greek letter Omega (Ω).

Illustration for Unit of Measurement
The component's impedance was measured at 50 ohms.
Visual representation of the word "Impedance"

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