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Calculate the resistance of a copper wire of 1-cm length, 1-mm radius, and 1.72 x 10-8 ohm-m resistivity.

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter18: Direct-Current Circuits

Section: Chapter Questions

Problem 41P

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Concept explainers

Temperature Variance of Resistance

Electrical resistance or simply resistance is the property of a material that opposes the free flow of electrons through it. The total amount of resistance to the flow of charges (or current) is affected by many factors like the length of the conducting material, its cross-sectional area, resistivity, and temperature.

Question

1. Calculate the resistance of a copper wire of 1-cm length, 1-mm radius, and 1.72 x 10-8 ohm-m resistivity.

Power, P = I x V

2. A 40-W bulb is used for 12.5 hours every day for 30 days. Calculate the consumption of electrical energy.

3. Show that operating a 100-W lamp continuously for 1 week when the power utility rate is 150¢/kWh costs R25,20.

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