Characteristic impedance

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What Wikipedia says

The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a wave travelling in one direction along the line in the absence of reflections in the other direction.

Excerpt from the Wikipedia article “Characteristic impedance”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Omegatron, CC BY-SA 3.0, via Wikimedia Commons.