What Does Impedance Mean?

Impedance (Z), in electrical devices, refers to the amount of opposition faced by direct or alternating current when it passes through a conductor component, circuit or system. Impedance is null when current and voltage are constant and thus its value is never zero or null in the case of alternating current.


Techopedia Explains Impedance

Impedance is often mistakenly said to be the same as resistance, which is not correct. Impedance is a two-dimensional quantity comprising resistance (real component vector) and reactance (imaginary component vector). Impedance is also known as the frequency domain ratio of voltage and current. Frequency is involved because of alternating current (AC) whose sinusoidal wave is generated upon a certain frequency which directly or indirectly affects electrical components such as capacitors and inductors, whose resistance varies with frequency of the power source provided.


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Margaret Rouse

Margaret Rouse is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical, business audience. Over the past twenty years her explanations have appeared on TechTarget websites and she's been cited as an authority in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine and Discovery Magazine.Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages. If you have a suggestion for a new definition or how to improve a technical explanation, please email Margaret or contact her…