A particular wire has a resistivity of 3.0 x 10-8 Ω ⋅ m and across - sectional area of 4.0 x 10-6 m2. A length of this wire is tobe used as a resistor that will develop 48 W of power when connectedacross a 20. - V battery. What length of wire is required?

A particular wire has a resistivity of 3.0 x 10-8 Ω ⋅ m and across - sectional area of 4.0 x 10-6 m2. A length of this wire is tobe used as a resistor that will develop 48 W of power when connectedacross a 20. - V battery. What length of wire is required?

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter17: Current And Resistance

Section17.6: Electrical Energy And Power

Problem 17.7QQ

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Concept explainers

Resistivity

Resistivity is a characteristic property of the conductor’s material that measures the extent to which the material opposes the flow of current. It is denoted by the Greek letter “rho”. Electrical resistivity, also known as specific resistance, depends on the nature of the material of the conductor and is unaffected by its dimensions.

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A particular wire has a resistivity of 3.0 x 10^-8 Ω ⋅ m and a
cross - sectional area of 4.0 x 10^-6 m². A length of this wire is to
be used as a resistor that will develop 48 W of power when connected
across a 20. - V battery. What length of wire is required?

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