I purchased 90 meters of 0.35mm2 stranded copper conductor wire. How can I test this wire for conductivity to ensure quality copper was used?
closed as too broad by Dmitry Grigoryev, Huisman, Dave Tweed♦ Jul 9 at 12:18
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measure the resistance: connect a 2A (or whatever load) in series with the wire and measure the voltage drop across the wire.
compare that with the published resistance for pure copper wire of similar cross section.