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Lab 03: Resistance and Resistivity

L a b 0 3 : R e s i s t a n c e a n d ResistivityINTRODUCTIONR esistivity is the tendency of a material to behave as a resistor. You already know that not everything conducts electricity equally well, and that some materials (like copper) resist very little, while others (like rubber) provide enough Resistance to effectively prevent the flow of current. Resistivity is a fundamental material property (like density or melting point), while the total Resistance (R) depends on the material, the geometry, and the temperature. The dependence on geometry (really, a volume dependence: cross-sectional area (A) and length(L)) can be quantified: R= LAwhere is the Resistivity . As you might expect, a longer wire (of any material) creates greater Resistance , and a fatter wire (greater cross-section) reduces total Resistance .

resist very little, while others (like rubber) provide enough resistance to effectively prevent the flow of current. Resistivity is a fundamental material property (like density or melting point), while the total resistance (R) depends on the material, the geometry, and the temperature. The dependence on geometry (really, a volume dependence ...

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