Resistors and Ohm's Law Video Lessons

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Problem: Pencil "lead" is actually carbon. What is the resistance of the 0.760 mm-diameter, 7.00cm-long lead from a mechanical pencil?

FREE Expert Solution

Resistance:

R=ρlA where ρ is the resistivity, l is the length, and A is the cross-sectional area.

A = πr2

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Problem Details
Pencil "lead" is actually carbon. What is the resistance of the 0.760 mm-diameter, 7.00cm-long lead from a mechanical pencil?

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