Conductor Cross Section: Small vs Large Copper Wire in 9V Battery Experiment

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leVanw
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I connected the small copper wire and the light to a 9V battery, the light came on, but when I changed to the large copper wire, the light did not light up.
 
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The large copper wire might be insulated with a clear layer of lacquer? See if you can remove a clear surface layer by scraping the surface with a sharp blade.
Any luck?
 
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