Transcription: The topic for this lesson is temperature coefficient of resistance. If the temperature of a length of wire is raised, the heat energy causes the random motion of the electrons to increase. On application of a voltage across the wire, there will be greater difficulty producing current flow or the movement of electrons. Thus, the wire's resistance will have increased as a result of the increase of temperature. The resistance of most metals rises linearly with temperature. Some alloys, however, resistances which are practically independent of temperature. Again, in other materials, for example, G ...
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