From the experimentally determined relationships
R ∼ I with ρ and A
constant, and R ∼ 1∕A with ρ
and l constant as well
as R ∼ l∕A the equation
R = ρ
× l∕A was worked out
and resistivity was introduced as a material "constant". The
students should use this equation to experimentally determine the
quantity ρ for common conductor materials.
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How high is the resistivity of some metals?
Determine the resistivity of copper, iron and constantan.