Example 27.2 The Resistance of Nichrome Wire The radius of a piece of Nichrome w

Question

Example27.2The Resistance of Nichrome Wire The radius of a piece of Nichrome wire is0.295mm.

(A) Calculate the resistance per unit length of this wire.

(B) If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire, what is the current in the wire? SOLVE IT (A) Calculate the resistance per unit length of this wire. ConceptualizeNichrome has a resistivity two orders of magnitude larger than the best conductors. Therefore, we expect it to have some special practical applications that the best conductors may not have.

CategorizeWe model the wire as a cylinder so that a simple geometric analysis can be applied to find the resistance. AnalyzeUse the equation and the resistivity of Nichrome to find the resistance per unit length: R = ? A = ? ?r2 = 1.5010-6?

Explanation / Answer

Electric field E = ?J ? = 1.5010-6?

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