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PHYSICAL PROPERTIES OF MATERIALS

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Electrical Resistance<br />

Resistance in a uniform section of material (e.g., a wire)<br />

depends on its length L, cross-sectional area A, and<br />

resistivity of the material r<br />

R r<br />

L<br />

A<br />

or<br />

r R<br />

A<br />

L<br />

where resistivity r has units of -m 2 /m or -m (-in.)<br />

©2002 John Wiley & Sons, Inc. M. P. Groover, “Fundamentals of Modern Manufacturing 2/e”

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