Is resistance in a wire always bad?
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The Physics
2) The resistance in a wire depends on:
a) resistivity - ρ a metals structural resistance to electron flow p. 4 Reference
b) Length (L) of the wire
c) Thickness (Cross Sectional Area) of the wire (A)
Ex) R, A relationship?
Inverse relationship 4
3) Resistance and Temperature
(Double Click on Picture above to start video) Full Size Video
Scientific Advisors: Dr. Saul Dushman; Dr. Roman
Smoluchowski; Dr. David Harker
Metals
T down, R down
T up, R up
(many electrical devices
Nonmetals – When temperature increases, resistance decreases
Superconductor - conductor with no resistance
Achieved only at very low temperatures
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