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Determining the resistivity of a piece of wire Resistivity Resistivity is a property of a wire linking the cross sectional area and lengths of a piece of wire. Resistivity is the measure of resistance to flow on a molecular level. "It is a measure of the resistance to the flow of current from a microscopic level, that is, as explained in terms of the atoms, the basic building blocks of all solid materials. The resistivity, ?? (Greek letter rho), depends on the behaviour and number of free, or conduction, electrons and not on the shape of the conductor, as does resistance." (http://mst-online.nsu.edu/mstonline/electronic/electronic2.htm) As explained above it differs from resistance as it takes into account the properties of the material. Resistance does not do this it is merely the ratio of Voltage to current through a material/component. Resistivity (?) is defined through the equation below where resistance is R length is l and cross sectional area is...

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