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How does the length of wires affect the resistance?
The resistance of a wire is given by R=rho*L/A, where R is the
resistance, L is the length, A is the cross-sectional area, and rho is
a number called the resistivity, which is a property of the kind of
material the conducting part of the wire is made out of (say, copper,
aluminum, or some other metal -- these will all have their own values
(republished on 08/02/06)
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