a) The time rate at which charge flows through the area is defined as the electric current. b) The resistance of a conductor is proportional to the voltage difference across the conductor and the current flowing through it. c) The radius of a Nichrome wire is 0.32 mm. Hence the resistance per unit length of this wire is about 3.1 0/m d) For a metal, the resistivity versus temperature curve is liner over a wide range of temperature, and resistivity increases with increasing temperature. e) An electric heater is constructed by applying a potential difference of 120V across a Nichrome wire that has a total resistance of 12.00. Hence the power rating of this appliance is 1.44 kW.

a) The time rate at which charge flows through the area is defined as the electric current. b) The resistance of a conductor is proportional to the voltage difference across the conductor and the current flowing through it. c) The radius of a Nichrome wire is 0.32 mm. Hence the resistance per unit length of this wire is about 3.1 0/m d) For a metal, the resistivity versus temperature curve is liner over a wide range of temperature, and resistivity increases with increasing temperature. e) An electric heater is constructed by applying a potential difference of 120V across a Nichrome wire that has a total resistance of 12.00. Hence the power rating of this appliance is 1.44 kW.

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter28: Current And Resistance

Section: Chapter Questions

Problem 68PQ

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