Definition

A measurement of how much a circuit resists the flow of electric current, especially in alternating current systems. It combines both resistance and reactance, and is often expressed in a complex form.

Example

The impedance of the circuit increased when the frequency of the alternating current was raised.

Conversation

Have you ever heard of the term impedance in electrical engineering?

Yeah, I think it refers to how much a circuit opposes current flow, right?

Exactly! It combines both resistance and reactance.

That makes sense, especially when dealing with alternating currents.

Synonyms & Antonyms

Root Explanation

Impedance is formed from "im-" (meaning not) and "pedere" (meaning to impede or obstruct). The term describes a measure of how much a circuit resists the flow of electric current, essentially indicating how it is obstructed.

Memory Tip

Think of 'not' ('im-') allowing something to 'flow' ('pedere') freely — that's why impedance refers to the resistance against the flow of electric current.

Visually Confused Words