Intuition tells us that a wire without defects should have zero resistance. But in the real world all conductors, however perfect, have some resistance. A new study confirms that electrical contacts are the problem.
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Chang, A. Resistance of a perfect wire. Nature 411, 39–40 (2001). https://doi.org/10.1038/35075201
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DOI: https://doi.org/10.1038/35075201