Answer in Physics for Sam #167752
Jadeen says that you can increase the resistance of a copper wire by hammering the wire to make it narrower and longer. Arnell says that you can increase its resistance by heating the wire. Which one, if either, is correct, and why?
Both are correct because the conductivity of the wire decreases when it is heated and resistance of a wire is directly proportional to its length and inversely proportional to its area.